It's hard for me to get my head around anyone, regardless gender, getting "taxed" from shooting 50 loads of 7/8 oz. shells. I'm absolutely not saying it can't happen, just hard for me to fathom. I've run through 1300 7/8 oz. loads a day for four straight days without a recoil problem, and I peg the scales at 170 lbs., when wet.
Good luck with the 3/4 oz. loads for your wife, Jeff. I'm sure she will appreciate them, and I know from experience what 3/4 oz. shot will do on clays and small game birds. I've proven it on many dove shoots with WW factory 3/4 oz. .410 loads and with my 3/4 oz. .410 reloads.