Almost no Sex with my gf for 6 months

Hello you beautiful LGBTQ Sexperts ! My Gf and I are together now for almost 6 months. A few months ago I was unsure how I should deal with her not telling me anything about her sexual desires, even got help from here. It turned out that she was a virgin. Well, that changed shortly before Christmas. Since then we didn't had sex again, even barely talked about it. Everytime I try to approach it, or just say something wich might has to do with it , she completely blocks the topic. The most far we came was when I told her (a little bit drunk) about my vibrator. The fact that she she can't even talk about sex makes me feel very unsure about myself even when I don't have a problem talking about those things, and it fills me a little with emberassment. Do you guys have any idea what I can do to talk at least a little bit more open hearted, besides Alkohol?