None of the things noted in the other thread should be applicable. The inadmissibility for Entry Without Inspection disappears the moment one leaves the US and is basically a dead letter in ways that aren't relevant here. None of the unlawful presence associated bans (3, 10, or lifetime) would apply since they didn't come into effect until the effective date of IIRIRA in 1997.
There is the very slight chance that they could slap her with "alien smuggling" however that is unlikely. The section of law in question boils down to "any other alien", i.e. one cannot get it for smuggling themself in. Basically she'd need to arrange for someone else to get smuggled in, and if that someone was a parent, spouse, son, or daughter - then there's a waiver available.
All in all, I think she'll be fine.