What should I do when my wife asks for help, then does it herself?

What should I do when my wife asks for help, then does it herself?

This is something my wife often does, and it drives me nuts.

Here's an example from last night...

After dinner, she asked me to wash the pots and pans. I went to get a towel, which took all of 30 seconds. When I got back, she was already washing the pots and pans.

Here's another example from a few weeks ago...

She created a pile of weeds and clippings while tending to her garden, and asked me to pick them up and put them in the refuse bag, as I was leaving to walk our dog. I said I would do that as soon as I finished taking our dog for a walk. When I got back 20 minutes later, she had done it herself.

So what should I do when she does that?

It's frustrating. I want to help but she doesn't let me.

What should I do when my wife asks for help, then does it herself?
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