Is she going back home soon? You can request an exception, they gave 30 days exception (so total 60 days from the initial request date) to someone.My mom is in Canada and today i got req for her biometric with deadline sept 29...she will be still in Canada....can we req ircc for an extension??
If she has a visa to USA, then you can do it in USA also.
If you need to request exception, do it ASAP as they might take some time to get back to to you.