mother and hubby advice

Long story short my hubby and I moved into my mother ms house to help her out because she can't physically work anymore. She has a bit of a buying problem. Keeps bringing shit into the house and not getting. Rod of anything. We've done a good amount of cleaning and clearing out since we've been here but all she does is bitch about stuff. We dropped 800 to redo her deck because the woods rotted and falling in. My husband busted his ass and got 1/4 it done before a few days of rain. I just got surgery so I'm stuck in bed for awhile. Mom just came on and said she doesn't want us to do anymore bc it's not the same wood they used...it is the same wood but now she's just botching about it. Hubby is pissed because he spent the money and there no appreciation for is trig to take care and help her out. If it doesn't change he wants to move which we can't afford really now but I'm not sure what to do. How do I have this conversation with my mom and make her realize how she comes off towards us helping her out. Help!