I guess at this point all you can do is keep gently coaxing her!! Maybe she'll cum (LOL) around?? I guess I've been lucky all my life as all the women that I have been with loved sucking cock and swallowing.
This is why when I wank I but the load in the freezer, so when I do get a bj I will cover my cock in that cum, without her knowledge although it will dry before she actually starts sucking. She has to still smell it and taste it I would think. She seems to suck it better when I do this. Maybe it’s just in my head lol.