Allocating Disk Space in a Linux VM-Collection of common programming errors

So, currently on a server I have a Fedora VM for an end user who remotes in. Unannounced to me, it was overfilled with data, and now has no more disk space. At this point, it crashed about a minute after booting up. I went into the VM and allocated more space, but it hasn’t recognized this yet.

So my question is: Is there a way to have the new volume partitioned and added on to the existing root space without the machine crashing before this is accomplished?