Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first.
How much is in the joint account?
But not all of the £80,000?
How old is your daughter?
In fact your daughter will need to apply for Letters of Administration in order to access any of the money.
Legally if she wishes to give the girlfriend money then of course she can do so - but there is no need to do so as the girlfriend has no legal claim on the estate as they were not living together.
You may also wish to point out that if her father had wanted to give his ex any part of his money then he could have written a Will - but he chose not to knowing that everything would go to his only child.
I hope that this is of assistance - please ask if you need further details