Oopps too late, only read this post this morning, although she only ate a tiny amount of it anyway.
What about boiled chicken? or Sardines (i guess would be like tuna)?

I have kitty milk, but it says on the bottle to only give a small amount per day, is this the rule regardles of the situation, or can I give her a bit more to help feed her up?

I don't think she is loosing weight, its just she was a very small cat before she got pregnant.

Thanks for all your advice, I really appreciate it!