85F/80+RH in veg. Be mindful of mold though. Should have a proper IPM regiment already in place, already in use on your mothers. Cannot stress that enough. I use about 3 different things. Sulfur, lost coast plant therapy and mildew cure as a preventative in veg.My issues have always been due to lack of climate controls. RH and Temps mainly.
Once in the flower room I'm trying to keep things a constant 75-77 degrees with a RH of roughly 60%. That's my target at least. Things fluctuate during feeds etc. last two weeks of flower (week 8.5 to 10.5) I try to get the room as cold as possible which is usually 72-73 degrees.
If you happen to be running rockwool, and even coco. make sure you are getting proper dry back in your medium. I cannot dress this enough also. I aim for 50% dry back before watering again in veg. OG needs a good root structure to show its stuff. In flower I go for 40% dry back. If I can time my feeds and get it all dialed in with environment it's a home run every time.