Since you are a Shichibukai and you are a really powerful person, then you would be an integral part of the Cross Guild. Of course, Madame Crocodile did not hesitate to recruit you to Cross Guild! You're more useful than a Buggy.

The more you were in Cross Guild, the more Madame Crocodile trusted you, that even you began to go shopping together and she began to spend more time with you, proudly calling you her friend.