non-owner

Mother in assisted living the daughter(non-owner) is living in unit. The daughter is name on a quick claim deed in case of death. The mother is living in another state, All paper transactions that pertain to the owner are sent to the owner certified mail it appears that daughter is signing her mothers name. Legality the BOD has hard time dealing with this. anyone got help

The Daughter is likely the power of attorney for her mothers affairs, it is legal.

Ignore the signature on the certified mail receipt.
Legality is, the issue doesn't matter unless you go to court.
Then it would only matter if the individuals claimed that they never received said letters.
Even then, the Board was working in good faith.
Of course, if the letters are being responded to, the possibility of that claim would be out the window.

If the assessments are being paid and the home is being kept up (paint, yard, fence, etc.), then who cares.

That said, I would expect that the certified letters are being sent because something isn't being done (assessments, upkeep,etc.). With the current pandemic issues and economy, I would be far more concerned in trying to work a compromise (payment plans, extra time, etc.) to address any issues then who is signing for certified mail.

You don't say what the problem is - "legality the BOD has a hard time dealing with this" doesn't mean anything. Is the daughter trying to cast a vote in an association election or run for the board? Has the unit been cited for a CCR violation and the daughter isn't cooperating? Are you on the board? If so, did you run this past your association attorney? If you're the daughter, have YOU run this past YOUR attorney? If not, start there - and perhaps bring a copy of the deed with you to see what it says. And maybe a durable power of attorney (if you don't have one, that may be a problem)

If the BOD is having a hard time they do not sound like they are the sharpest knives in the draw.