What if you told her exactly (word for word or close) to what you've told us in this post? Be as honest with her as your have been here about your feelings? Maybe you already have but I didn't read this that way? If you haven't, then she knows exactly where you stand. That should give her something to think about if she wants to stay there. If you don't see any Improvement, well,... like everyone else says here, you're well within your right to get her to move out. (jmho)

She lied to you - whether it was a lie of omission or something else, it was still a lie.
Your son was complicit in that lie by not telling you.

So you are fully entitled to feel as you do.

You may have previously said she can stay, when you could see the break-up looming, but the lie and the freeloading changes things.

Sounds like you have given her fair warning to get out - end of March.

You are well within your rights to justifiably feel the way you do.

Is this young woman depressed?
Why doesn't she want to live with her family?
Is she incapable of working or holding a job?

I’d be pretty upset at this situation too. Ya she needs to move back home asap.

How does she repay your kindness? Does she help out atound the house or contribute in any way? You need to ask her to go.

I agree. Her time is up. She’s gotta go.

Tell her to gtf out, it’s your house and she’s disrespecting you and freeloading and has the nerve to tell you what to do in your own house? Set her a deadline to get out

And also your son is better off without her, the nerve

Better tell her who’s the boss in the house and that she should start looking for somewhere else to live

Give her six weeks, no more

if you stay for free and dont have a job, then im gonna make all the noise i want. if they dont like it, then peace out.

How old is she?