She's a rather sad figure. She was Charly's only child but was basically ignored by her mother and when she wasn't ignored was treated badly. She spent more time with her grandmother EF than did Wilhelm's children and Vicky was very fond of her and felt badly for how she was treated. She did think Feo could be rather shallow though--more interested in clothes than intellectual pursuits (though few were as interested as Vicky). Feo had many falling-outs with her mother over the years. At once point, her mother basically refused to allow her to step into the house or have her name mentioned. This drew the concern of not only Vicky, but of Henry & Irene who allowed Feo to take refuge at Hemmelmark. Henry wrote quite scathingly to his sister about it. Feo eventually married Henry of Reuss in 1898 and while she had the approval of that match like everything else her mother soured on it and the marriage became a huge source of controversy between them. Henry was a good husband and they loved each other but Charly, perhaps because Henry didn't like her or her treatment of Feo, would soon come to detest him. Unfortunately they would have no children--though if she had had a child early in her marriage QV would've lived to be a great-great-grandmother. Feo is believed, like Charly, to have had porphyria and her life is a series of physical & mental ills. She committed suicide after WW2--I think she was widowed by then--by sticking her head in an oven.