@Vanida *****
I believe you need to file a TM30 EVERY TIME you re-enter the country.
Some immigration offices may require you to file a new TM30 even if you travel inside the country...depends on your immigration office.
Regardless of what the 90day report reminder email says, your 90day report will be due 89days after you arrive back in the country (the day you arrive counts as day 1).
If you are leaving the country before your 90day report is due, you do not need to file it.
When you return again and re-enter the country, you will need to file a new TM30, and your new 90day window will begin.
If you're still not clear on this, you may want to stop at your local immigration office and ask them for help. Good luck.