As she's likely on a rolling contract now, you could just arrange a provider switch for her online? It'll be cheaper for her and she'll get a new router.
https://www.moneysavingexpert.com/phones/cheap-broadband
Is that something the new provider would handle? I.e. I'd call them up and say "please sack off bt on my behalf and i'll sign up to you?"
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As she's likely on a rolling contract now, you could just arrange a provider switch for her online? It'll be cheaper for her and she'll get a new router.
https://www.moneysavingexpert.com/phones/cheap-broadband