If you use your MR number you will be listed as the primary person on the reservation and her name will be there for check in but not on the reservation confirmation sheet. Shouldn't be a problem though. Also, I believe the spousal benefits have to be a married couple. You can also buy points when needed...up to 50,000 each per year.

https://buy.points.com/PointsPartner...EN&product=BUY