I'm thinking TS wasn't at the stage where she was ready to retain a divorce attorney to file and prep for a custody battle. Rather, I think she may have been considering her options. Assuming the attorney who drafted the will and trust documents had a good idea of the assets at stake, perhaps TS was looking for general legal advice and/or a referral. I don't think she was ready to move forward with a divorce, yet. Or, maybe she recently discovered something suspicious but not alarming - like a financial statement that raised a little red flag.
I read an article recently about a nanny who stole checks and embezzled hundreds of thousands from her employers. Nanny intercepted the mail to make sure the compromised account statements never reached the family. Scheme unraveled after a year, the statement came in the mail one day when the nanny didn't get there first. Who knows, maybe MS was siphoning funds into his own secret account and she discovered this somehow...or, more likely MS painted a much rosier picture of the finances and in reality, the financial picture was drastically different. IMO, TS was in the dark until shortly before her death and even then, the truth was just slowly revealing itself.
A house of cards scenario is at play here, and IMO, we are only seeing the tip of the iceberg (, unpaid rent).TS may have metaphorically loosened the first card and its only a matter of time until the whole deck comes down. As horrible as it is to say, MS may have thought murder would solve both big problems; 1. The immediate problem, TS discovering extensive, long term financial betrayal 2. The root problem, financial ruin. With TS murdered, MS no longer has to worry about keeping the truth hidden from her and probably thought between fundraising and life insurance proceeds, he could turn the financial situation around before the house of cards came down.