It DOES send mixed messages when you are able to perform activities that are more strenuous than need help with basic daily activities. Anyone dealing with WC, LTD, or SS will tell you that for a claim of disability to be treated seriously, there will be an expectation that you are incapable of performing strenuous activity.
Why not hire a local kid or service to do the job instead of investing in new machinery? Or ask your daughter if she's going to continue living with you?
My son is in Michigan on an internship and his landlord pays to keep his walkway clear. Considering his rent--I can't imagine the service is even remotely expensive.