I find with the grass coming through our older mare is more prone to puffy legs - that includes her windgalls coming up a bit (both of ours are barefoot, only one gets puffy legs so don't think it is realted tbh, although she gets much less puffy legs than when she was shod).
I think there might well be a link to spring grass intake as my pony's windgalls are huge at the moment, and no other reason why they should have increased!