I doubt she will understands you. but dont worry too much, cuz “Waqt sab sikha deyta hai”. so dont lose too much neurons on her.
but no matter what you have to talk this thing out with her, not just for your own safety but also for your ex-student to not to lose her sanity.
if she admires you she must acknowledge the limit and must draw line afterall this is purpose of getting education and knowledge to define between good and bad.
The problem in Pakistan is girl think that there is no hijab when it comes to women. just look on the TV, when girls call on the TV shows the way they express their gratitude, appreciating clothes, personality its a like a 5 year old is talking. we often neglect these things but i literally find it disturbing where girls have such a limited thinking.
ps. you could use one of those filmy dialogues instead of threating her by changing your number, or informing her parents about her unethical behavior or leaving the town “Kay ager mujhay pasand kerti ho tu mujha say phir kabhi baat mut kerna ”