So yes. My mother-in-law bends my will better than anyone else on this planet.

Don't argue the details of what she says. Instead, focus on the behavior. If she oversteps, use calm, matter-of-fact scripts like, "I'd rather not discuss that topic".

After two years of this quiet transformation, I’ve learned a few survival strategies. Not to resist her influence—resistance is futile—but to maintain my own core.

If you feel like your will is being bent a little too far, it’s time to reinforce your boundaries.