on the one hand, the brutal, cold and emotionless hard-arse in me agrees with the cynic in you and would send an email about your concerns to whoever's decision it was in your company to bring them in and see what happens. they're the ones responsible for this situation. it's their problem. you might even be doing the offshoring company a favour because they might not know how bad the person is at the job.
at the same time, your manager (or whoever) might not even think it is a problem. maybe "their problem" is the risk of your team's budget getting slashed next year? maybe they just don't care and just want offshored devs around because .... well, that's what some kinds of managers always want for some reason that escapes me.
she does sound terrified. and the human part of me would absolutely struggle with this. but you are not responsible for her or her livelihood. you're responsible for you and yours (and the people around you depending on your position/role).
really, it depends on your manager. are they going to care about this? they're the ones who hired them, it's their arse on the line for spending that money.
> a few months ago we got a pair of offshored Accenture devs join our team to help meet some deadlines
> I had finished all my tickets for this sprint and was looking for work to pick up
your company got offshored devs to help with deadlines, but you've finished all your work for the sprint...? that sounds ... incongruous.
edited -- sorry basically rewrote the damn thing.