I have had various friends and family with us at WDW over the years!
It was finally my turn to take my parents. Dad wasn't overly excited.

Mom has health issues. They really enjoyed the trip especially the DVC/OKW 2 BR!

They have been back several times with us!
That being said, they weren't roller coaster types anymore...or so they thought. Yea, I lied and told Mom Splash Mountain was a cute little ride based on Song of the South. Boy, was she surprised. She screamed I am gonna kill you on the last drop.
They weren't "in" to doing all character meals and all rides so we went our own way during certain times. Can you do this with Mom without hard feelings? Will it change your touring plans to a certain degree? Sure.
In my opinion, the biggest problem can be the relationship before you head to WDW. If you can't be honest and feel comfortable speaking your peace than it can lead to a difficult" time while there. Common sense, no? My DH and I as well as my parents have no problem and take no offense if either wanted to split up and do there own thing!
I also think if it's more like a once in a lifetime trip that can potentially lead to probs. If you know your going back, I think it's fun seeing WDW through others eyes.
It is a different trip when my parents come along but I love having them with me and my family!
Ask Mom for example, if it's gonna bother her when you do HM etc and if waiting for you will be "ok." If she doesn't mind and can appreciate soaking up the atmosphere then maybe this will turn out to be nice fit? Can you tell her that having a Character meal is a must on your trip and how is that gonna work when she's not ineterested? Ask her, Mom, will you be miserable if I do the character meals?
Good luck and happy planning!
