In order for your wife to be able to show repayment for the Home Buyer's Plan, she is required to be the purchaser of the RRSPs, as well as the annuitant. Unfortunately if you are the one who purchased the RRSPs, they can not be used to repay your wife's Home Buyer's Plan.
http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/rrsp-reer/hbp-rap/rpymnts/menu-eng.html#rpng_wthdrw
