Good on you. Sounds as though she is more open to what your doing, and I wouldn't go about thinking she has hidden agendas because of offering to pay for equipment, or anything like that.
Why can't a female partner not be on side with her man that does penis enlargement? I have seen in the past allot of responses on this topic, but allot of prejudices, fear mongering, insecurity from men regarding women.
You both have an open honest relationship with communication, which is the key. Be mature about it, and you'll both be fine.