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No - she can not stop you from putting a panel up on your own side, even if it is higher.
You panel can be up to 2 meters generally without planning permission.
But as long as you do not damage her fence then she can not stop you.
It is your land so you can do whatever you want on your side.
Can I clarify anything for you about this today please?
Thank you for replying and answering our question.