Brain tumours recurring

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Hi there, We are looking for some advice and wondered if anyone has had any similar experiences and treatment options. My mum is suffering from brain tumours which are secondary tumours. She's just had 4th tumour removed but they keep returning as tiny cells are left behind. She has another tumour they were unable to remove so she had gamma knife. We would like her to have gamma knife in the whole where the 4 tumours have been removed to hopefully stop them growing. Her surgeon has said because she's had so much radiotherapy it isn't possible. Has anyone had any similar experiences? Or any other ideas gratefully received. Thanks in advance :)
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