Why Do Some Folks Feel Entitled to Stuff? Read This:

[salin]

161. Does she rent or own?

If she rents perhaps she thinks her land lord has an arrangement with you (paid) and thus the 'entitlement'?

If that is the case - perhaps a conversation could be had under the guise of not having a problem - or getting lectured in the future. Between snows broach the subject in order to avoid confrontations in the future (using that explicitly as the reason for the conversation.)

Explain why you blow her driveway and walk - as a neighborly gesture and that it makes you feel good to be helpful. Then point out that this is different than shoveling (which takes much more exertion) and that at this point in your life (age) you wouldn't likely be so generous if it required hours of shoveling. Hence why you didn't put the extra exertion into the frozen down patches. - But you can offer her advice on how to minimize getting those patches (don't tamp the snow down before clearning - or do so minimally), or what she can do to minimize the patches after you clear the snow with the snow blower.

Gives her a chance to either realize her mistake (if she thought someone was paying you), and be neighborly/appreciative - and take an active role in solving the "problem" (her family's creation) of the packed down snow that froze to the surface that a blower isn't able to get.

It's the only 'nice' way of addressing it, being able to maintain the neighborly giving of service and avoid any future entitled outbursts that really do diminish the feeling good of having been helpful.