It doesn't seem like human nature to be thinking about tax cuts - unless she really wasn't just a few blocks away. I think she is just using the platform to knock Bush.. like Mother, like Father, like daughter.
Yes. Consider what some call the "hypothetical construct" of a destination for liars and cheats and others who are sinful, unrepentant, and stiff-necked; consider that it features a "lake of fire." Now, consider an actual spherical object, formed of H2O in its solid form, somehow finding its way to said destination. The chances of Chelsea thinking about tax cuts at the time of the attack are roughly equivalent to the chances of said snowball's lasting in that environment.
She's a little Democrat stepford-daughter. Taxes are always on her mind, especially how to get them from you.