Sansa had actually chosen the baby boxes for her volunteer opportunity as well. She's not very athletic and her long gowns don't allow her to run anyway so while she'd cheered others on at the color run, she'd not participated herself. Kissing Booths were straight out - Sansa has no desire to kiss anyone but Baby and she certainly doesn't want to hurt him or make him cross even if it is for a good cause.

So, she and Lady had elected to go fill baby boxes instead. Derek is there and as he's the only person she recognizes, she comes up close to him in hopes that they will be able to talk while they work. Lady sniffs him, wanting to learn his scent, and she seems to be intent on figuring out what is different about Derek, to the point where Sansa is mildly embarrassed.

"Lady, calm down. Derek is not looking to harm me and he's a kind man. He's not someone to be suspicious of." Lady looks up at her mistress, slightly ashamed, but goes on investigating Derek anyway.

"I have no idea what's gotten into her," Sansa says, starting to work on a box. "She must just be taking an inordinate interest in you because she likes how you smell. Do you have a dog, possibly? She always smells Baby's dog on him and spends a good half hour climbing over him to put her scent on him when he comes over."