It depends the terms of the guarantee. Usually, you can only get out of it if your granddaughter vacates the property.
Sometimes, they are specified to just be for the initial tenancy but that would be unusual. There is no incentive for the landlord having the benefit of a guarantor, to release that guarantor.
It is worth mildly mentioning that if you did not get a copy of the tenancy agreement at the same time as the guarantee, then the guarantee is not enforceable anyway.
Can I clarify anything for you?
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Indeed. You have done all that any citizen would be required to do. Best wishes.
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