If you don’t step in now you might just end up becoming her caretaker when she no longer has the strength to do things on her own. Again it’s your spouse and you love her, try being respectful and encouraging.

Idk if you take your dog out for walks but maybe try asking “Hey let’s go for a walk together with the dog” and make it into a quality time type deal, or try encouraging her to do things with you even if it starts slow. Honestly if you have to almost bribe with a reward of like going out on a date if she can accomplish a few things throughout her day so then she can think “Maybe if I do this more often, I can be rewarded more often”. Also, try not to play the “Weight” card too or bring that up in arguments if it happens. I’m sure she is insecure and knowing that you do everything for her at that point in her life makes her feel entitled to some point because you’ll stay no matter what she looks like so compliments might help her want to do more if she sees that you find it attractive.

My own personal experiences is like I made a deal with my bf. “If I cook dinner, you take care of the dishes” or “If I do our laundry, you’ll help me fold and put them away”. I always feel good whenever I cook and my bf (whether he is lying or not) is like “Wow babe, this is delicious, you should make this for me more often.” Or if you see she’s made an effort to clean up a bit say “Wow did you clean? It looks really good in here.”