So I met this girl and some heavy flirting went on (teasing, touching, lots of eye contact, etc.). Now I want to ask her out but an acquaintance of mine (not someone I hang out with often) mentioned she has a BF (she never told me about any BF nor was there any mention). One thing I noted was that I gave her my email so she can send me some of the poems she wrote (we're both into poems) about a month ago but she never emailed me but the flirting still went on nevertheless. I never reminded her about it since we're both busy with school. I'm not heavily pursuing her and have been avoiding being on her friendzone (I never tolerated any disrespect from her if any at all). She's usually the one who approaches me first but I also do it at times.
So my qustion is should I ask just ask her out straight or should I directly ask if she has a BF first?