I assume this was directed at me? Clearly your communication issues arent just with your girlfriend. You leave highly relevant information out and then you're mad we ask? lol

If you look at any of the other responses on here, everyone is basically saying the same things (1) you need to talk to her and (2) she may not like oral, and that seems likely given the facts we have.

It's highly relevant information here that you're just seeking to perform oral for your own benefit and not hers (let's be real here, she doesn't want it). That really should have been included in the prompt, because you're in a position now where you're trying to do something to her body that she doesn't want as opposed to please her. Basically, this conversation that you're going to have with her is about meeting your needs, not hers.

You told us in your post that she simply does not engage in oral on her, not that there are other issues with trying other things. It sounds like that's really the issue here is a lack of overall breadth of sexual activities that you do together. You should let her know how you feel about this. Perhaps she doesn't understand that you're dissatisfied and need some/all of things to have a happy sex life.

Anyway, this whole issue is really about you and your wants, not about her. Talk to her about your unmet needs.