I think its a nesting thing. She is mid 30s and looking to settle down and does not want to take any chances. That plus early stages of relationship bring in the clingy factor. Call me old fashioned, but I consider 6 months a short relationship unless its a bang buddy situation. As sad and red pill as it sounds, women's options narrow a lot once they hit upper 30s so she (at least subconsciously) is locking that shit down. I think if you just set the tone of having your own independent shit while at the same time demonstrating that she has nothing to be concerned about, you are on the right path. If she freaks out hard core, well then you know why she is single at 35 and its time to pull the rip cord and you dodged a bullet. If not, then you deal with the next bump in the road.