In the old days if you played in more than 30% of your games you couldn't red shirt. Paige has played in 6 of 31 scheduled games, so under previous rules she could. I don't know if the rules have been updated.
I believe the Medial Waiver rule is:
Injury occurs in first half of the season
Less than 30% of the season
The doctor must certify the player is unable to return for remainder of the season.
Then the player may apply for a waiver.
Notes: Players get 4 years eligibility to be completed in 5 years. Players must apply for a waiver to extend the 5 year window. With the COVID free year Paige already gets 5 years eligibility. A Medical Waiver would give her a sixth year. I can't see Paige forgoing turning pro past 4 years much less that long.