Claire had not signed an LOI yet, just a verbal. Kopatich's case could be more like Katie Robinette's where she has to sit out a year and lose eligibility for that year. Unless the Big 12 would grant an exception. Don't count on it.
Her case would be like Mckenna Treece who signed with KSU (never played still in high school) then was released from her LOI after Deb Patterson was fired. Kopatich has never played a college game, so the B12 can't force her out for a season. The issue she may run into is a new coach letting her out of her LOI.