You ask about the sun coming thur window. This is one other reason I thought maybe the reason for all of this
She just moved a month ago and her heat changed air is dry but the plants get more sun as they are facing the morning sun and her windows in the area of the plants get sun from morning till night all day sun. That was perfect but it was a change too. and what if Windows are cold or drafty does that ever hurt a plant? ?? Its not staying cold at yhe windows but i noticed the draft n wonder if that has affected them at all.. curious. ..