Babysitter Needed For My Children In Tacoma.

I have a work conference in Tacoma, WA on 11/15 and my childcare just cancelled last minute. I have a calm and well behaved 7 yr old daughter who will now be coming with me from Portland, OR (driving tonight and staying at the hotel, and am in need of childcare during the duration of the conference (roughly 8 a.m. to 5 p.m. but can go later and leave an hour earlier if needed). I am happy to extend the hotel room for a second night if the care giver needs somewhere to watch her while I'm at the work event, but am also open to her being at the home of the babysitter if that is an option. I'm a single mother and in need of figuring this out ASAP so that my job doesn't exclude me from future opportunities.