Re: i'm not sure what to do.
I pretty much agree with Kelly. If she has a few days to get used to your parents I think she'll be just fine. Kiddos at that age tend to be really attached to the boob when it's there and when it's not there...it's not.
I left Nora overnight with DH when she was about 19 mos and we were both really afraid how the night would be since she nursed pretty much all night at the buffet, but she was perfectly fine, woke less than usual and didn't even take a bottle when she did wake. She saw I wasn't there and just went back to sleep.
If there are other kids there or new things to look at and play with I bet she'll have a great time. Maybe your parents could take her somewhere and do something fun with her to distract her for a few hours, too.
“We are not put on earth for ourselves, but are placed here for each other. If you are there always for others, then in time of need, someone will be there for you.”