What's your question? If you are wanting to move in together, you would have to have your income added to hers to see if you will qualify together. If that makes the total income too high, you both may have to move out or lose her benefits. If you move in without notifying the landlord, she can be evicted for unauthorized occupants.
Trade her in for a new model then. One willing to stand on their own two feet and not live like a parasite.
I'm sorry. Have you tried looking for a better girlfriend, perhaps one with a job?
....and your question is?
Maybe it is time for an upgrade.