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I am afraid a Will is a private document, until the party dies, when it becomes apublic document (once Probate has been granted).
Therefore, unless your mother is prepared to disclose the contents of the Will to you, there is no way you will be able to find out if she has made a new Will.
Her Solicitor is bound by client confidentiality, so even as a beneficiary, he/she will not disclose if your mother has made a new Will.
Sorry this is not the answer you were looking for, but it sets out the legal position.