I am not certain if it also applies to CC, but according to the ISC2 Membership Reinstatement Policy, a member will be given:
- 90-day grace period
- 2-year suspension period
https://www.isc2.org/policies-procedures/member-policies#:~:text=ISC2%20Membership%20Reinstatement%2...
So, it is unlikely an account get suspended immediate after missing the maintenance fee payment.
It will depend on what "account" means -- if that is the ISC2 account, the most likely situation is it is not suspended, just a login issue. Otherwise, she can contact the member support by email.