Revoking a talaaq

Q: I have said to my wife on telephone call "that I divorce you". This is the first time I said this.

1: Can I take back my divorce without intercourse as she is in a different country and we cant meet now? So can I take back verbally only?

2: My wife is a doctor, so during iddat can she work as a Doctor in her country?

3: Me and wife live in seperate countries so can she do her iddat in her own country or is it necessary that she lives with me during iddat?

Sincerely repenting for one's past

Q: A muslim unmarried girl has affairs with multiple hindu boys for several years secretly and her family is not aware. Now her family is getting her married to a muslim boy. She says that she has realized now that she did wrong and would like to do Tawbah. Can she repent now? Will her repentance be accepted? And now how can she repent?