The thing about gravity, it's basically negligible unless the object is planetary in scale.
Think about it, the Earth, which has a mass of 6x10^24 kg (6,000,000,000,000,000,000,000,000 kg) can't even generate enough gravity to pull a helicopter down to the ground. So how the hell does a snatch that small generate enough gravity to pull a helicopter in?
It could have been air being sucked in through her contracting vaginal muscles or something, that would be more believable and actually possible.

Base +6, REA713 +5