What test do I give??

I’m doing my CF at a school and just started this month so I’m very new to everything. I have a re evaluation for a junior high girl who has cerebral palsy. She has an AAC, but she has expressed she does not like using it. She can verbalize some CV and CVCV words and she uses a lot of gestures. For the most part, she communicates her basic needs without the device. If her teacher can’t understand her, then she gets the device and has her type what she wants. Also, she is an ESL student, so the device is not used at home due to the device being English only. So my question is, what tests should I give her? What should I do about the AAC? I’m truly at a loss and any advice or questions I should ask would be appreciated.