Can she hide the smell when there's a leftover in her face?
Bro, there’s cultivation arts to make an entire illusory universe and seal all original senses
hiding a little smell is laughably simple in comparison
The only question here is whether she has any methods to do so, but since she apparently knows hundreds to thousands of medicinal herbs, at least one likely has the ability to suppress smells.
Personally, I would think the bigger challenge is to hide the mark of vital qi and yang qi in the semen, rather than hiding the smell.