The fact that she stays over 5 days a week is still completely different from her moving in. If you want it to stay "your" condo, it's going to be difficult when she starts moving all her stuff in. If you want to do anything to your place, you're going to have to take her into consideration too. I'm not saying "don't do it," but you both have to be completely sure and it doesn't sound like you feel that way just yet (I could be wrong).
I don't know the both of you so maybe it could work out. I've had friends who moved in together and have had it go both ways.
As for taking half your stuff... apparently common law spouses can also be entitled to "spousal support" otherwise known as "alimony."
Spousal Support In short: it's basically child support... but the child is the spouse and you're paying her so she can sustain the lifestyle she had while she was with you.
It's always good to be cautious and realistic about the possible consequences, but if she says she won't take your stuff and you actually trust her, it shouldn't be a problem.
I wish you the best of luck!