K.W.
As far as the ear infections, GET TUBES PLACED. Winter time is coming up and she has already had several infections. This will only get worse this winter. I waited 9 long months with my first child hoping he would "out grow" them. HA,HA. Din't happen. He never had another ear infect. again.
As for the diarrhea due to antibiotics, try Lactinex grannules. Mix it in her baby food 2-3 times a day. It must stay refrigerated until you use it. I used this with both of my children and it is WONDERFUL!!!!! Especially for Augmentin, which caused the WORST diarrhea. You can find it at most pharmacy's but I would call first. Some do not carry it. You do not need a prescription, but it is kept behind the counter due to need for refridgeration. My pediatrician recommended it to me. I think that it is about $12 for a pack of 10-15, but IT WORKS and is worth every dollar.
Oh and when my 4 1/2 month old was going on his 5th ear infection, I scheduled his tube placement. He is now 10 months old and has only had 1 ear infection since, which was easy to treat with antibiotic ear drops. NO diarrhea. Good Luck. Ask your pediatrician if you are unsure of the Lactniex. It worked every time for me.