If she cashed it at the issuing bank the money is ready. Is she deposits it at her bank it will be ready in 3-5 business days. ACH transfers take time. Cash deposits do not. If she got paid on a Friday it might be 5 days before she would be able to withdraw.

I used to cash my paychecks at a check cashing store for the same reason. Even though they took a small fee the convenience of having money for the weekend was worth it.