No way! I like to think of Breastmilk as a multi vitamin that tastes yummy.
So remember that you are doing her so much good with each feed.
As for night feeding, there a lots of mums who are happy to feed at night and sleep next to bub. If this is working for you and you don't want to change it then don't! All those night time cuddles she is getting are helping her to feel safe and secure and will help her grow into a confident toddler.
Sounds like you are doing a wonderful job with her.
Check out this website for some lovely info on extended BF and sleeping next to your bub www.askdrsears.com
Your daughter thanks you!