I got off with her advisor just now. He said this was for rebalancing reasons which is based on WF DSIP (Diversified Stock Income Plan) portfolio based on a set of individual companies (I guess slightly more conservative, focusing on dividends). The reason why the other purchases happened the next day is sometimes it's slightly out of balance and they have to manually go in to make it balance correctly. (I thought that was odd.) He also said there are no extra fees for trading.
He mentioned that due to the performance of the magnificent 7 in the SP500, he acknowledged it's not performing as well as the sp500 recently, but it's more stable and appropriate for a retired person.
Considering the 1% aum fee, and the fact that she has multiple pensions to support her spending, I'm going to encourage to switch to Fidelity using a few low-cost stock and bond indexes and t-bills for cash) although I'd prefer to do that when the market drops (so I don't get blamed if there is a drop after switching over).