I don't get how pool expiration works.

As I stated months ago, I extended my mother's pooliles with my activity.

Today, I noticed she had 0 miles. I logged into her account and 14k expired Jan 4 2020 so I guesy 5 trips Oct-Dec didn't refresh her expiration.

It looks like May 3 was last time my activity refreshed her expiration.

The terms say:
K. Individuals miles may still expire based on their last accrual and not the accrual of the entire pool.

​​​​​​That's just annoying as activity from Head of Pool (me)refreshed expiration and previously and then it just stopped.. She was given notice of expiration before but none this time.

beware if you are counting on head of pool activity to refresh miles!