Buy your daughter a Bounty Hunter Tracker IV, lists for around $150 but you can get it on fleabay for less than $100 shipped. Its a coin magnet once you learn how to use it! Check my totals below for 2 months!
Read, read, read! everything you can in this forum, and watch some U-tube videos on metal detecting...there are some good ones and some bum ones, but watch a lot of them. If you find some on basics, watch them!
Then scope out the area you live, starting with your yard and then outward in an ever enlarging circle! City Parks, School yards, church play grounds.
Hunt the school yards after school, not during!
Hunt the Parks early in the mornings or late in the evenings.
Hunt the church playgrounds any day but Sunday!
Concerning playgrounds, you will soon learn where the concentration of coins are, but that they also may be scattered about anywhere!
I only own one MD presently, but I will say I have heard very good reports on the ACE 250 and 350 mentioned elsewhere in this string.
The BH Tracker IV is basically a turn on and go detector. I like to keep it simple and have now figured out how to discriminate most iron and poptabs so I do not dig them anymore. If I go to a new type of place, I run full metal, but if I go to any of the places I mentioned above, I run for coins only. Saves a lot of digging and speeds my recovery time!