Try clearing your cache
https://www.bungie.net/en/Help/Article/12539
Then revisit her and try to collect the reward.
EDIT: Bungie is aware and investigating the matter.
https://www.bungie.net/en/Forum/Post/199959560/0/0
English
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still happening
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Bungie is aware of this issue and investigating the matter. https://www.bungie.net/en/Forum/Post/199959560/0/0