Thanks unknown. It seems it was just it.

Even with the two blooms Anniversary Merry gets from Danchou level 175 and 200, which would take several months to reach, you'd still need three skillblooms and two dressblooms to cap Merry's skill level and equipment access.
You got 2 Merry. One from lvl 150 (I guess) and one for a certain amount of login day. But yes, you still need one dressbloom.
But for a reason I don't remember, they gave us another copy of Merry. Older players may have her fully slot-unlocked (that's my case).