But their plan to offer enrichment is too vague.
It usually is. "Enrichment" often seems to be a nonsense word thrown out at parents to placate them.
A GIEP, on the other hand, cannot be a jumble of nonsense buzzwords. It needs to contain items that are directly measurable. So my first question would be, what does the IEP say? If it's full of nonsense, then that can be your trigger to review it, because they did it wrong. Otherwise, you can still ask for a review, because it's not enough, although I believe they don't necessarily have to honor your request in that case (which can vary depending on local laws or the individual personalities involved). Or, at the very least, you can start thinking now of what measurable items you want to see in her IEP for next year.