what I would do, is take her guitar (with the pop-in pickup) and try out both the acoustic and the electric amp... sales people at music stores usually work on comission, therefore they try to get you to buy the most expensive thing that they can. if it sounds good through the electric amp, then go for it, you don't NEED an acoustic amp. I would just avoid turning on the overdrive channel of your electric amp, it will create quite a bit of feedback because of the acoustics hollow body.