I remember getting the Japanese manga for this. Honestly, it seems like the mangaka is losing all interest in the manga. The art style starts phoning in around volume 4-5, Mami hardly does any magic, and when she does, it is canonically NOT the kind she uses in the show, guest appearances (IE her other magical friends) are mostly in the first 4ish volumes.
I personally found it really disappointing, as I would have loved a Slice of Life of 30 year old magical girls where they are just trying to get by.
Probably the best Madoka spin off that does this the right way was Madoka Engawa (but it does it while the girls are still teens) but pulls off the magical slice of life almost perfectly (and hilariously)