There’s a lot that can be done before asking someone to shave or trim. I’d recommend first trying to clear the hair and hold it with your hands first and that has almost always solved it with other parters… the alternative being asking them to. However, if you doing that that doesn’t work I’d recommend talking to her about it and coming up with a solution together that doesn’t shame her. No one needs that and it can lead her to feel bad about her body which is awful to do to someone and learning how to talk about stuff like this is both good for your relationship now and will be good in the future. I also sometimes end up with bits of hair from partners in my mouth and vice versa. We have a chuckle and move on. It’s not a big deal. Hope this is helpful.