AIO for being worried my daughter feels like she needs an escape plan?

Am I Overreacting?
My daughter is 21, married, has a baby, and lives in the eastern part of the United States because her husband is in the military. He’s away for another few months.

She planned to come home to the south for about a month while he’s gone. I offered to pay for her travel because she’s homesick, misses her family, and I thought it would be good for both her and the baby.

When she told her husband, he wasn’t just disappointed. He repeatedly tried to convince her not to come home at all. Insulted the idea, called it “retarded”and He told her to wait until December instead of coming now so they can come together. (He used some pretty unsavory words) the way he spoke to her, some of his actions definitely had me worried.

When she questioned why he was acting like that, he brushed it off instead of explaining. Eventually she told him, “It’s literally like you want to trap me here.”
This isn’t new behavior. It’s been a pattern throughout their relationship. That’s why these messages concerned me so much.

Afterward, she told me she didn’t even have the energy to argue with him anymore. At one point she told me she felt trapped because she had no money of her own and was worried about driving a vehicle that she believed he could report stolen.

I told her: I respect that she’s married, and I’m not trying to tell her what to do. I just want to make sure she knew she and the baby always have options.

I encouraged her to keep all of her and the baby’s important documents together where she can access them quickly, have an account in her own name, keep whatever emergency money she can, and remember that if she ever needed to come home, I’d make sure she got here. No questions asked.

What surprised me was her response.
She told me she’d already thought about all of this. She already keeps all of their important documents together, has her own account, has multiple backup plans, and has talked with others about what she’d do if she ever needed to leave.

That broke my heart.
I’m not trying to break up their marriage. In fact, I hope she never needs any of these plans. But as her mom, it worries me that my 21-year-old daughter has quietly built an escape plan because she feels like she might need one someday.

I didn’t tell her this, but it made me think back to every conversation her and I have had about these issues, and to me there is a pattern of emotional manipulation, isolation and controlling behavior that looks to be escalating.

I thought at first it was a young couple trying to figure out marriage and a new life, but as she sends me screenshots of their conversations and hearing what’s going on I’m on the verge of emotionally freaking out.

So…am I overreacting? Is this something you’d be concerned about if it were your daughter, or am I reading too much into it?