Has the girl lost her virginity as a result of inserting her finger into the vagina while performing istinja (ablution after defecation or urination)? And what is the reason for the discharge of blood after a period of cessation of menstruation?

It appears that your fears are unfounded, and that the hymen is still intact.

We advise you to consult a specialized doctor for benefit. When you become pure from menstruation, either by dryness or by the white discharge, you must promptly perform ghusl. This is the fatwa we issue and it is the more cautious approach.

If the bleeding returns during a time when it could be menstruation, you are considered menstruating again, and ghusl becomes obligatory upon its cessation.