My new rabbit isn't eating?

I just got her two days ago. She's two years old and I believe she is a Florida White. I adopted her from my local animal shelter. She is perfectly healthy and has no illnesses. She is spayed. Anyway, to get to the point, she isn't eating. I'm sure it's just because she isn't used to being at my home, but it concerns me. She is my second rabbit. I have an almost 4 month old mix of some sort whom I have had since April 26th. I've tried hand feeding her and she just sniffed the food and hopped away. I tried giving her a treat (Kaytee timothy hay biscuits baked with carrots) and she took it from me rather vigorously and nibbled on it for a little bit then put it down and hopped away. She roams freely on my deck so I put a few treats in different places around the deck in case she stumbles upon one and wants to eat it. I believe she is eating her hay but I haven't seen her eat anything besides the grass that pokes through the fence on my deck. I'm going to pick some grass (no pesticides) and give her it and see if she eats it. If she does, I'll give her a full bowl of it and continue to do so until I can get her to eat her pellets. I also have picked her up and brought her over to her food bowl. She showed no interest. How can I get her to eat? Should I just feed her grass for a few days and see if she starts eating her pellets?