Baby nursing less

I’m not sure what’s expected at this age. My daughter is 9 months and has been noticeably nursing less.

She eats a good bit of solids during the day and really only wants to nurse before naps and bed. During the day though, she would rather play than eat. I can’t get her to nurse longer than a minute or so.

My supply is good but I’m curious if it could hurt my supply with how she’s been nursing lately.

How long would it take this far in (as in ebfing for 9 months) for my supply to drop, if it were to drop?