I think being realistic is important, after all, the unit is sold in "as is".

I do not know what you mean by functional obsolescence. I would say that if a small refrigeerator is a problem to the potential shareholder, this is not the co-op's problem. The new shareholder may wish to do renovations and will then apply to for alterations as per policy in place. If an interior non-bearing wall was taken down to make a closet smaller or larger, the new shareholder will have to re-evaluate the space according to need.

I would only be concerned as a co-op as far as violation to code. If none were made such as making a room without appropriate ventilation or adding plumbing where nothing existed w/o board approval or making a full electrical upgrade, it would be pointless to make life miserable to daughter and buyer. As a co-op you may demand inspecting the unit in order to note deviation from original as you may only wish to maintain as a co-op those areas that were original to the building v. those that were added that could change the responsibility of co-op /shareholder.

Selling a unit without carpet is not a sin nor anyone demand it. Just make sure the new shareholder installs one when it moves in or escrow at closing the money to install one.