She might say that she needs space and shifts her mind as soon as you agree.
If you're exposed to that, be smart, stand in your own truth and do what you feel is right rather than what she tells you to do.
Sometimes your confidence and clarity can override her doubts and bring her back to a place of trust.
A soft "give me space" boundary might be a head or fear based decision.
Pushing through that boundary might dissolve resistance and invite her to surrender and relax.
You need to listen to the multiple dimensions of her suble message.
In that case what she might be saying is
"I want to stay connected but I am afraid"
"I feel I am losing myself"
"Back off a bit, it's getting too intense, but don't disconnect"
Women expect men to figure it out.
You need to understand the conflicting messages, the shifts in feelings, the insecurities, etc.
Those are often hidden in subtle hints.