is NO requirement to send money to your partner as proof of relationship.
Some people use it as further/additional "proof" of a long-term relationship, but if
your case is strong (many meetings, continuous e-mails, photos etc), then it loses it's
significance.
I would be VERY careful with transferring money from her to you.
That would indicate to the ECO that you need her support to survive ... not a good
way of trying to convince him that u have sufficient funds to support her visa application.
