Smarkley is the only one on here I know with any experience using the New Anderson RT. You may want to ask him. I can say from experience the new Anderson singlewall (Flex) feels nothing like the older Andersons (Flextech, Pyrotech, Nano) and not in a good way. Performance wise its ok but its way too tingy sounding for my taste and no feedback.
If her Fastpitch bat was 34" she should be able to use it in ASA slowpitch (unless there is a league specific rule against using fastpitch bats). Also given most older RT's are going for under $100 and they are known to kick ass I would just pick up an older RT--lots of them for sale on SBF. Truth be told, unless you are a power hitter, you are way better off getting a Fastpitch RT which is going to have a much bigger sweetspot than it counterpart slowpitch RT (and I am not saying that just because I happen to have one for sale)
But seriously, shoot up Smarkley if u want more info on the new RT's.
EBJ