Recovery and MD are good to have for her, but other than those you don't need a special mastery setup for her. She benefits from suicides but doesn't need them.
I did the 6.2.6 Champion with her plus Blade (to help clear the path), Ghost Rider (for his synergy with Claire), and Star-Lord and Drax (for their perfect block synergies). The most important part of that fight is learning to cleanly dex The Champion's specials. I did it on the second hit of this SP1 which you can do and take no damage.
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Btw didn't they fix this bug?
I did the 6.2.6 Champion with her plus Blade (to help clear the path), Ghost Rider (for his synergy with Claire), and Star-Lord and Drax (for their perfect block synergies). The most important part of that fight is learning to cleanly dex The Champion's specials. I did it on the second hit of this SP1 which you can do and take no damage.