Many thanks. Apologies for the delay in reverting to you - I had to take a phone call. The position here is that the works you are carrying out would appear to fall to be subject to the Party Wall act because you are or have been excavating within 3 m of her building. the party Wall act does not just cover works which involve work on a shared party wall but also where you are excavating within 3 m of a neighbours building or 6 m of a neighbours building where you are digging deeper than their foundations. This creates both good and bad news:
The good news is that the party Wall act provides for a right of access to her land either with or without her consent and will enable you to enter onto her land in order to gain access to enable you to complete your works. without this component in the party Wall act, there is no right to enter onto her land without your neighbours consent unless you have a specific express right in your title deeds which is probably unlikely. There are rights under a piece of legislation known as the access to neighbouring land act but these rates only extended safaris maintenance is required and do not cover improvements or building works therefore the party Wall act is you are only way to force access so it is as well that the works appear to be covered by the party wall act.
the bad news is of course that already serve the party will notice, in order to gain rights under the party Wall act, you will need to do so and this will create delay at this stage and potential expense if your neighbour insists upon the appointment of the party wall surveyor.
Ideally therefore, if you can reach an understanding with your neighbour including potentially a compromise where your neighbour has genuine concerns such as damage to her property (for example an offer to make good any damage caused). You could even consider offering to improve something for her as a gesture of goodwill - this may be cheaper and quicker than going down the Party Wall Act approach even if it costs you a little money to make the offer) this would likely be the better approach as any other approach is likely to at the lease cause not insignificant delay and hence cost.
Does the above answer all your questions? If it does, I should be very grateful if you would kindly take a moment to click a rating for my service to you today. Your feedback is important to me. If there is anything else I can help with please reply back to me though