hi info.123,
there is no definite answer as YES or NO if they will ask for your spouse RCMP fingerprint,the fact that you have been asked is not a strong indicator.
cpp-ottawa runs a criminalty check for all applicants directly because they have an access to the RCMP database,they only ask for fingerprint if your name comes up so they need more proof to verify that you hold no criminal record in canada.many people have a matching names so only the fingerprint can clarify more.