She is probably letting it sink in. Give her time.
I came out to my sister that im very close to. 100% accepting yet shes had no comments or questions about it. Has this ever happened to anyone? Is it me just expecting too much?
You have to expect that she needs time to process this. I would be happy that you could tell her and not put any unrealistic expectations on her too.
It is important that we know that we have been heard when we talk to others, especially when you are very close to the person you confide in.
In this case and with this subject matter, it's quite possible that she is simply somewhat stunned as much as she might have been if you had told her you had just won the Nobel Peace Prize.
You could say to here that you would like some feedback about what you told her and that you would like to talk to her again about what's going on in your life.
Yin and Yang and Barb Cala gave you good answers.
It's hard to say .. But, perhaps she already had her suspicions, or it may take some time for it to sink in .. Or .. She just doesn't have anything to comment and that may be perhaps because she just don't know what to say.
If you want to know what she's thinking .. Ask her.
She needs time to let it sink in. I read an interview with Cher after her daughter Chasity came out to her. She has always had gay friends and had been accepting of the gay community, but it took her by surprise when her then daughter came out. She admitted that she didn't handle it well at first. She wondered if there was something she did, even though she knew that wasn't the way it works. She wondered how she could have missed it. She also worried about how people were going to treat her. It took her time to process it all. Once given that time she became her biggest advocate. We Chasity then told her that she wanted to become Chaz, a man, Cher was there for him. Just give your sister some time.