New name for anonymity.
H and I met when we were young. We were together constantly, and I spent quite a bit of time with his mom even if he wasn't home. We were buddies, and had a different relationship than we do now. I called her "Momma". 
Looking back, I wish I had never started this. After many years (it's been 10 now), our relationship changed. I still love her, of course. But "Momma" was a term of endearment. I don't wish to call her that anymore. Things came to light about her that I didn't know, and the constant borrowing of money (thousands, that has never/will never be paid back) over the years. (Her and SFIL still ask us for money sometimes, but the answer is almost always a no- unless we have a time set firmly when it will be paid back) There is always drama, and H and I end up playing more parent roles than we should. Thanks to DWIL, this is coming to an end.
Really, the biggest change for me was when my daughter was born. For some reason, something just snapped for me. Her attitude (Giddy/overly excited/always trying to act innocent/wanting to play mommy) changed the way I felt about her. My DD is 3, and it's only gotten worse. I don't enjoy her company like I used to. We get along, but honestly it's forced on my part.
Now that I'm pregnant with #2, and she lives closer (she lived several hours away with first LO), she is really grating on my nerves with trying to play GMOTY and wanting to play mommy. I feel like I have a good handle on these issues, and H and I address them as they come up.
However, I don't want to call her "Momma" anymore. I would prefer to use her first name. Is this silly? She would definitely notice that I was using her first name. I'm not trying to start drama with her, and I feel like this would. She is very sensitive, and although I know her feelings are not my responsibility, I feel like she would take this hard since there was nothing to "cause" it. (In her eyes) I also thought about just calling her by her Grandma name (which is unique so I don't want to say specifically what it is), like DD does. Would this be out of line? Or, should I just deal with it?