The hints for the sentence display "Her, feminine, pronoun, dative"
But "Ей" in Grammar help is listed as Instrumental ; dative is Её.
So either Grammar Tips or the hints for this sentence are wrong.
"Ей" is Dative
Instrumental is "Ею" (although "Ей" is also acceptable in spoken language)
"Её" is Accusative and Genetive
Thanks for your answer, in that case I guess the grammar help needs to be updated.
Apart from the mentioned issues with She, I have noticed that Instrumental for They is false - should be "ими".