Tan, personally I wouldn't give her an extra bottle. If she needed more she'd eat it. I know I made the mistake early on of giving Jack milk when he wouldn't eat and it was so hard getting him back on track and eating properly. I think you are better off just offering the food and not fussing if she doesn't eat it. When her appetite picks back up she'll eat it then. And she will do that when she needs it.

I know it's hard, having BTDT I know how much we feel the need to feed our kids. But sometimes letting them eat when they are ready and not worrying about it is the right thing to do, even when it feels wrong! Big hugs, I hope everything settles down soon.