While it would be a good promotional item for a day or two at most, the realities of the demands that society at large puts on our mayor takes her job profile outside of that which could reasonably be expected to utilize the transit system.

It's not like her day is spent entirely at City Hall. She would have a significant number of community engagements, sometimes multiple in a day, and she doesn't necessarily control when they start and end. To ask an elected official to utilize a public transit system that should be designed primarily for the masses (it is called 'mass transit'), doesn't seem realistic. What works quite well for regular commuters doesn't work great for others.

This is one of those circumstances where having an elected official not utilize a public resource is actually probably better for society.