Bonsai Nut
Nuttier than your average Nut
She had someone come look over the collection and give her est prices on what he thought the trees were worth.
She may find she is better served going with an auction format with no reserve. Decide up front if you are going to ship, how you are going to ship, and how much you will charge for shipping. Then hold the auction and you won't have to answer hundreds of random emails
Worst case is to get an estimate that under or over values the trees. Then you will either lose money, or not sell the trees. The value is what the market will bear. If she is willing to ship, she will have a larger market to competitively bid.