Yes, you are allowed to use tampons and other feminine hygiene products. For inmates that have money in their commissary account, there are several choices and brands available for purchase (the prices are similar to that of a grocery or drug store), If the inmate does not have extra money on their books, most of the facilities provide a standard product that is suitable.

Normally, these items must be purchased through the commissary.

You cannot send a cross necklace - but an inmate is allowed to have it. What you might be able to do is speak with a counselor or case manager and tell them your desire. They might make arrangements for you to send it to them and then they would give it to the inmate, OR check to see if you can bring it to visitation. Also, InmateAid has a wide variety of Birthday Cards that are only $0.99

There are no rules that require inmates to get their head shaven or even a haircut. The facility has a barber that is run by the inmates. Inmates pay for the "service" with something from commissary that amounts to a $2-3 worth of goods.