It was a big step involving Ron in her plans. If he was still working for his old mentor Rabastan, she could be in a great deal of trouble. They might decide collectively that she was more trouble than she was worth, Rodolphus" orders be damned. She desperately wanted to believe that there was a part of the old Ron still tucked deep inside the Death Eater just as she hoped there was a part of the old Hermione somewhere inside her. Just having her sitting in his kitchen put Ron and his entire family at risk. She felt like she owed him something.