No, before you ask, this doesn't give Mama Murphy a modified Mr Handy. This is just a small cosmetic change to make Mama Murphy look like one of her concept art pieces: https://vignette1.wikia.nocookie.net/fallout/images/b/bc/Mama_Murphy_in_chair.png/revision/latest?cb=20160104190835 
                                                 
Basically, the mod turns Mama Murphy into an older black woman like in the concept art featured in the image section.

Mama Murphy Chair Sold Separately