IMHO, the best chameleons to start with is the Veiled (although they can be nasty tempered), the Panther or a Jackson's Chameleon. These 3 species seem to be the most widely available in the pet trade and rarely are they WC animals anymore, particularly in the US where you are located. Each have different husbandry requirements, so let your friend read up on some caresheets and decide what will be easiest for her.
Click
here for a caresheet on the Veiled's.
Click
here for a caresheet on the Panther's.
Click
here for a caresheet on the Jackson's.
There are plenty more caresheets and books around for further studies.
Have fun!
Trace