If she's really paying $300/week, then absolutely. Checking Enterprise's website shows that my local Enterprise would rent me a small car for a week starting tomorrow for $225 (including taxes and fees).
Things must have drastically changed in the last seven years then. Between 2008 and 2010 I drove rental cars almost full time with horrible credit and a debit card. The weekly cost for a car was 170 and if I went monthly it was around 600.