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Most like yes. The frequencies and systems used in Thailand is the same as UK. The only requirement is that her phone is unlocked. If she is able to install an over the counter SIM card from Thailand (I.e. 1, 2 go), she should be able to install any SIM card in the UK.
If she is coming to the UK and you are not traveling with her, you may want to send a SIM card to her in advance so that the moment she is in your country you can connect.
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