Thanks all for your sound advice. I completely agree to slow things down. Too much to digest to make rush decisions. As much as I'm eager to talk to sis about things, I try to only bring it up as it relates or she asks questions.
She told me she wants to talk to someone else about what's going on with me. She knows several people with some type of gender dysphoria, but was afraid because she didn't want to "out me" to someone I don't know. I cleared her to talk to someone if it can help her understand. "But, please make sure that person is trustworthy." She thanked me. So, I'm pretty sure she already had someone in mind.