R.,
The not chewing sounds fairly normal, especially since she doesn't have many teeth to chew with! You can't really "chew" until you have molars. The front teeth are for biting pieces off; the molars are for mashing. My 15 month old still wolfs her food down. If we give her too much at a time, she will choke herself. I would continue to feed her soft table foods, cut into small chunks, that she can mash in her mouth. Avocado and soft fruit are great choices. Harder fruits can be steamed for just a couple minutes - I did this with apples and DD loved them. Just put a few chunks on her plate/tray at a time and refill as often as you need to.
It does sound like she is drinking A LOT of milk for her age. I would talk to her doctor, or do some research on your own, but I believe the normal quota of milk for this age is closer to 12 oz a day. When babies are taking a lot of calories in from milk, they don't need as many calories from food and are consequently uninterested in eating.
I would also be cautious about soy in general. It is supposed to be a "healthy" food, but it does contain plan estrogens that act on our bodies the same way our own estrogen does. Estrogen is a sex hormone that is also associated with increased rates of cancer. A lot of the information on soy has been drawn from traditionally prepared asian soy products. American processed soy products are not prepared the same way. Asian preparation changes the composition of soy, and so western processed soy products may not be as healthy as we have been led to believe. The big push for milk is the calcium, and there are other foods that she can get calcium from. If she likes juice, you can give her some calcium fortified orange juice, or she can eat processed dairy products like yogurt and cheese. My DD is not "allergic" to milk, but she is definitely intolerant of raw milk. When I tried giving her milk for the first time, she got horribly stinky diapers and constant diarrhea. So now we just don't do milk. She gets plenty of other processed dairy products, which don't bother her.
You mentioned that she is not gaining weight. Is she losing weight? Does she seem happy? (when she isn't sick.) Is she active and interested in the world around her? Does her skin and hair look healthy? These questions are WAAAAAAY more important than where she rates on a growth chart. It is really common for babies to slow or stop weight gain when they get really mobile. It makes sense, since they are expending more energy in walking, running and climing, and they are also less likely to sit down and eat well. Also, the beginning of the second year is when babies' genetic tendencies usually kick in. My first, for example, always topped the weight and height charts until she started walking at 9 months. Her dad and I are average height and weight. By the time she was about 15 months, our daughter was pretty much middle of the road on the weight and height charts, which is probably where her genetic tendencies are.
My first daughter didn't gain an ounce from around 10-14 months of age, but she grew five inches! She was completely fine, but just growing at her own pace.
If your daughter does seem to be ill or lethargic, than there probably is a problem, and you need to talk to her doctor about it. I think, however, that it is more likely to be a health issue than a starvation issue. It is way more likely that she has a food allergy (or an intollerance, which will affect her, but will not show up on an allergy test) than that she is wasting away due to lack of food. Most of the time, children will eat when they are hungry and stop when they are full. It's only when we train them to use food for comfort or have power struggles with them over food that their eating habits get skewed. As far as I know, fever is not associated with food allergies, but gas and diarrhea sure are. Her doctor might have some good information for you, but you will probably get more help from a local dietician or allergist. Just remember that if she does have allergies, you need to treat the allergy, not just mask the symptoms with allergy medication.
Eating is such a tough subject for so many moms. Just remember not to make it a power struggle with your daughter, because YOU WILL NOT WIN! It is not our responsibility to make our children eat. It is our responsibility to provide healthy food options and let them do the rest. Your daughter will definitely eat when she's ready and not a moment before! Try not to worry about what anyone else's kids are doing, or whether she is eating like a 10 month old or a 20 month old. Just let her grow and learn at her own pace, and things will be fine.
Best of luck,
S.