The Most Holy Family Monastery is run by a couple of sedevacantists known as the Diamond brothers. They do not believe that any pope since Pius XII… or is it John XXIII… one of them anyways, has been a valid pope. They do not believe that the Pauline Mass (the one that is normally said these days) is valid, and I am pretty sure they do not believe that ordinations done in the new, post-Vatican II rite are valid. In other words, the majority of the priests and bishops in the Church today are not really ordained and wouldn’t be saying real Masses and consecrating the Eucharist into the body and blood of Christ even if they were.
Your daughter does not have to attend Masses there, and in fact it is not permissible to do so, as the Monastery repudiates any communion with the Church, in favor of their belief that the true Catholic Church exists only in the few faithful followers that have abandoned the current Church. If she prefers the Latin Mass, she may now find one at any number of places since the advent of Pope Benedict’s Motu Proprio.
If she subscribes to the particular beliefs of the Diamond brothers, then you would have to ask particular questions about particular beliefs of theirs so that you would be able to receive answers.
Peace and God bless!