Kitty's grin couldn't have been broader. When the door started to open she pulled her hands back and went solid again. When it was fully open there was a split second where she checked to make sure he had nothing in his hands or anything. She was already in the air at that point, but she could have phased through him if she had to.
She jumped just as she said she would. Her legs going around his waist and her arms to his shoulders. His wings weren't really a factor.