Why am i feeling this way?

Hi, just wanna clarify if i'm the only one feeling this way. I'm dating A. I think we have a prob. The prob is, it's not about A and i. It's his mom. Yeah yeah she's kind and soft spoken, i realise she's too quiet and indecisive in things she's doing. She depends on A too much from household chores to making decision! We've just dated less than 2 years and i've already felt the pinch with her attitude. No we're not living together, but many at times A and i argue because of her. A loves his mom, very much and i've tried making ends look nicer. It's just that this feeling.....i don't know how to decribe, but it's irritating seeing somebody so needy as her and worse, she's purely messy! So in the end she hopes for A to clean up the mess for her. Whenever we try teaching her new stuff, she purely doesnt take interest because she knows, A is there to cover stuff for her. Oh gosh pls help me here.. am i the only one who feels this way? We're not married yet, worse if we are. Pls help me deal with this lady.