You just want to make sure that her accounts’ total is under the $250k limit for FDIC insurance. If one of these banks goes under, and you’ve got more than 250k in there, you’re likely screwed (though there are different rules for trust accounts with multiple beneficiaries, etc, so your mileage may vary).
She has itf accounts which has my sister and brother as beneficiaries so she was told today that she is insured up to 750k but she is the primary holder so not sure if that makes a difference