Installing Wordpress on sub-domain - reached database limit

Hello,

I have been trying to make a wordpress install on a temporary sub-domain called test.thrivewithautism.ca
After a few failed attempts it seems there is a database limit on the account thrivewithautism.ca?
This seems odd as I have not seen through many types of hosting companies - please let me know if we need to increase the account size, or what!

I am the web developer for the site - the account owner Jackie McMillan has approved this message ;)

Many thanks,