Do you mean that you are not close to the computer to try?No access to system at the moment.
If above suggestion does not work, what else could I try?
Or, you can boot to an OS X system on an external drive. You should be able to browse to the internal drive and remove some files/folders that you don't need, but take up space.
Emptying the trash via terminal didn't work...or you didn't try?
I think that the root cause of this problem is some phantom Trash folder on the system which badly needs to be flushed out. Daisy Disk is reporting a 450GB Thrash for the only user.
I do not have access to the system right now
Have you deleted a file from an external drive or perhaps from Time Machine on external?
If yes, try ejecting the drive and see if the Trash is now empty.