What happens to my wife's OA visa status if we leave Thailand before her 90-day period ends and obtain a re-entry permit?

Could use a bit of advice. We, myself & wife, entered on OA & O visas. We had planned on her 90 days, applying for a extension based on being my family member. It appears we need to leave the country. That would be about mid-ways to her 90 days. We'd need to buy a re-entry permit for return. When returning, would she be stamped in for the remainder of her original 90 day, or would it be 90 days from entering, Or, if after original "stay to date", would her visa be expired? Thanks for any advice, we've just done the OA visa before, and that was pre-covid era.