But only if she lived with you in your country. And she must not have lived in Thailand for more than 6 months at a time in the last few years before receiving the goods in Thailand.
I did it that way too. Thai Dtac e sim . Then changed smartphone. That was it with the dtac number. In Australia I would switch the contract to prepaid. With phone number portability and physical sim. This means you can charge the SIM if necessary and simply change the SIM if you change your smartphone. And no stress with the accounts.