Tabby, I would be willing to guess that your DH might be offering your services. I would mention to him that it's not acceptable to do so and have him tell his co-worker that your time is too limited to do anymore repairs. UNLESS they are willing to pay $15 an hour for your time. Maybe you are too accomodating...if they send a repair project for you to do are you dropping whatever else you are doing to get it done? Some people are just too nice..I suspect that is the case with you..
It's called "tough love" learn to say NO and mean it.
If she sends another project just say. "Oh I would love to help you out BUT I am in the middle of a project and it might be months before I could consider doing this for you" and politely return the item to her. I am sorry I sound so mean..I don't even have time to mend my DH's clothes that he wants fixed...happy stitchin' (on your own stuff) crafty_linda_b