A.D.
I think we have to learn to go with our guts and not repeat the mistakes of our parents sometimes. Our little ones go through developmental stages, and many of them have to do with becoming a person separate from us. They also seek to be able to control parts of their lives as they grow. They are trying to learn how to make choices. If we can remember this, we can avoid some of the control battles, especially the ones that can make our lives miserable. Some issues we have with our kids are about who is in charge (like no running into the street), but eating should not really be one of them. My favorite book that I used to read to my children about eating was Bread and Jam for Frances by Russell and Lillian Hoban. There are others in the Frances series about going to sleep at night, about friends. Sometimes I felt they helped me to calm down.
Talk to your doctor about your concerns about her protein. Yoghurt, cheese and peanut butter are good sources. My pediatrician always told me to look at what my kids ate over a week, and I would see that they usually had a pretty balanced diet. And she always looked at their growth chart and saw it was within normal limits.
I always introduced foods that we were eating to my kids, but never forced them to clean their plate(I was a stubborn child and I can remember sitting at the table for hours with milk getting sour or with liver and onions, which I now love). I asked my daughters to take a taste at dinner, that's all. Their tastes will change, and they will get more adventurous. Right now, her taste buds are more sensitive than yours. I always tried to include one healthy thing in the dinner that my kids would like. But I did not cook separate meals for them. I also let them stand on a sturdy chair and "help" me cook. At first they liked watching. Then they learned to do little things, like help to measure and learn volume and fractions. As they got older, if they didn't like what I was cooking, I suggested that they make what they wanted for dinner. This was generally a peanut butter sandwich or a cheese sandwich, or macaroni and cheese. Then it became salads. Or soup.
Children will eat more when they are in a growth spurt, and less when they are not. I used to think my kids were becoming breatharians when they would eat nothing (or so it seemed) for days. But looking at it over a week will calm your anxieties.
One technique that I was able to use when battles were looming was to offer my child a choice of two things that were acceptable to me. They got to choose, and I got them to do something acceptable. This distracts from the battle, and gives them experience in choosing and being self sufficient. And they get used to things that are good for them. My girls are grown now, and they are very decisive and self-sufficient. When they first learned to dress themselves, they had strong opinions, and I let them pick. And then I got relieved from having to dress them earlier than I expected. Now they think that I have bad taste. When they didn't like how I brushed their hair, I let them try it.
I hope this will help you a little, so you don't have crying and anxiety and battles when your new one comes. And your big girl will have self confidence and respect so that she will help you with the new baby instead of resenting it. She can get things for you. She can snuggle next to you when you are feeding the new baby. She will know that you have enough love for both of your kids.
And with these developmental stages, I always found that during the tough ones, just when I thought I could not stand it any more, they moved into a new and better one, before I sent them to military school.
One more thing - there was a little girl down the street from us who would only eat noodles, maybe with butter, but never sauce or anything else. She literally ate nothing but noodles for years. But she grew up tall and creative and graduated from an excellent college and is very smart and supporting herself. So don't worry if you have little bumps on the road to growing up. Good luck and enjoy every moment. You will not believe how fast they grow up.
An Old Mom