What did he see in her? Sure wasn't her looks!
I think it must have been her motherly attentions, and her strong sense of family, which anchored Chopin the expat (even if he did experience "family problems"). She must have had a certain unselfish and totally giving way with Chopin that made him feel quite loved and cared for... she knew how to make a man love her, as she had so much practice before Chopin! She catered to his needs, and provided a "fortress of solitude" for him to compose his greatest works - her summer residence at Nohant.
Chopin was, of course, a snob. Sand was not Polish, and he may not have read her books, but she did spring from royalty, and had married a Baron. And she was famous. All this certainly helped. I have no doubt that he eventually found her beautiful. We look at her portrait and wonder why, but Chopin knew her, and fell under her spell, which made her beautiful in his eyes. My opinion only.
By the way, George is the one swooning in the brown leather armchair, behind Liszt.