19 month old was always a picky eater, but now she wont try anything new, and wont eat more then 3 bites when she does it something. she will only drink milk, with no fuss, she has 3 bottles a day, wont eat anything else only maybe cookies, if that any advice? its been like 3 weeks. will she outgrow this?

I think her suggestion is to set reg. scheduled mealtimes, eat in the highchair (like no running around house snacking, etc), offer an array of healthy tasty stuff (including stuff your dd likes) and leave her alone. You may need to offer less milk, isn't there a limit over which it fills them up too much? I am sure you can find this out in the AAP book.