Is a girl who experienced the insertion of a finger into her vagina at the age of seven, and felt pain, considered to have lost her virginity, and what is your advice to her?

The young man's behavior was harshness, weakness of faith, and a violation of natural disposition (fitra). Strive to forget the matter, as there is no benefit in dwelling on it. What happened to you may not have removed the hymen, and even if it did, it was not due to an indecency. If you marry and the husband discovers the hymen is absent, inform him that you did not commit fornication and that there are multiple reasons for its absence, such as menstruation or jumping, as it could be due to something other than intercourse.