@Yvonne ********
just so you know, at the end of the day YOU are the one that gets hit with the fine of not having done a TM30 on time..
Why notgo to the immigration office and ASK if you need to re-file a TM30 for in country travel.
OR
post on a Phuket related f/b page (of which there are several). I'm sure you'll get the correct answer.