We sold 2 houses and some swap land (long story), all out of state, without ever leaving Florida, all the paperwork was sent back and forth as necessary, and notarized as necessary, used local (PA and DE) realtors.
I agree with above, simply advance your mother some money (if necessary) for the items you listed, and have her (or you) hire a local (Canadian) realtor to represent your interests in the sale and handle all of the paperwork.
JMHO, not very knowledgeable in real-estate transactions or law.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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