You are asking this question like Im clairvoiyant. Maybe wait for a Dragon Flashback if she's the mother
You are missing the point. Oda often never writes mothers (rather women) to be that deep, except Otihime (see Toki, Rebecca's mother, Ginny, Bellmere, Olvia, etc). It would 150% be more important to Dragon, similar to how Ginny is barely a character and all of that was pushed forward on Kuma (which Im not complaining about personally).
The fact that she was given a title card when Oda could have just left her nameless like he did for Gaban for years should tell you that shes probably important to someone's story.
Edit: Just going to leave this here
Not to mentioned she's introduced in chapter 11
56 of all chapters and her hair literally references the number lol