Upgrade limits

I am curious if there are some upgrade limits that are not obvious?

Trying to upgrade Bariss' "Force Heal" from level 4 to level 5.
When I go to the screen all the requirements are met, just got her to 48,
but the "upgrade" button is still grayed out.

For ability mats I have 23/5 and 13/5.
She is currently 4* and gear level 6.

Am I missing something?

Thanks

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