Honey don't you worry about your deposit.
You have an inventory right? How detailed is it? How recent is it, is it accurate and did you sign it? Do you have any photos on your inventory, do you have any photos of the garden/house etc?
Your only obligation is to return the property in the condition in which you received it. Any better and you are ahead.
If you have been there for a considerable period of time there has to be a reasonable amount of fair wear and tear. We have had recent additional guidelines from the TDS people which stress the need for fairness.
If you know you are going to be checking out, then we can coach you to make sure you protect as much as possible.
This is what I do for a living, checking people IN and OUT of rental properties.
She does have to give you 2m notice and it has to be on your payment/contract date, ie tomorrow. Give the notice any longer and it won't take effect until the date of the next payment date, i.e 25th June, and it will still be 2 months from that date. Even if the tenancy does roll on, it is a statutory periodic agreement and she STILL has to give you 2m.
If you want to go sooner, you can counter-serve notice, but again on the same date.
OK, so what aspects of the house are you worried about? was the house professionally cleaned for your tenancy, carpets cleaned or new condition? what is the condition you need to reach to return the house as you took it on?