Dreaming of a different life...

I'd probably try to find a different solution, personally.

I would not date someone living with another person, especially an ex-partner. I suppose the average person is more open to it than I (especially since there is a child), though.

I assume you're closed off to the option of attempting to repair the relationship with your ex-partner?
Yes, it ended over 2 years ago. We remain great friends but our life styles are too incompatible.
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Every situation is unique, and must be calculated on its own facts, but the first thing I would pursue is getting a more favorable mortgage. Personally, I would use a line of credit, retire the installment mortgage you probably have; these are widely offered at 3% or less, and you don't have the liquidity drain of having to pay principal. It's a floating rate product, but you'd cut your perceived expense (I say "perceived" because principal is not an expense) in half immediately, and probably be done with school before interest rates could rise enough to make that a problem - in any case, if that even happened, you'd probably have gain on the value of the property.
I have no idea about any of this. I'll look into it though. I'm in Canada, things might be different here. I think my biggest obstacle is that my daughters father is still on the mortgage (not on title though) because I can't qualify on my own. Most of my income is under the table.

Second, I would make sure you are not overtaxed. Many people who purchased a house within the past several years would benefit from a property tax appeal.

...
I feel like living with my daughters father is the only option ...maybe I should just look at it as "working on myself" time and not date.

Of course, the other option is to find a guy that will move in with you, pay you rent, and support your school endeavours.

Yes, I expected your qualifications to be the gating item. You might even convince your ex-partner to accept this liability again (I can't imagine why he did once, though.) Even if you cut him a share of the savings - in any case, he is in for a shock if you have a financial problem. That risk he already has. We purchased the property together 3 1/2 years ago. I have been trying to get him off the mortgage since, but I can't qualify. He's actually in a really bad financial situation right now, he can't help me with this.

The large property he's living in is a vacant house that his parents own. He's supposed to be taking care of it but he doesn't so his parents suggested that my daughter and I live with him mostly because they hate getting letters in the mail from the city about the yard needing maintenance or from him not shoveling snow all winter.

I did date women who lived with parents - but if there's dysfunction, I could see not accepting it.

One good thing about your plan, is that it is not very high risk. Moving in together, even taking a tennant in the property, are things that can be undone without huge effort or expense. The rental income, avoided child care cost, and increased education all sound substaintial in securing your future. Impaired dating, for a limited time, is not much sacrifice for that.

Would you really find an office job paying "decent money" in this economic climate? I know here in my country we're getting rid of staff and cutting pay.

Are you sure your plan is a good one?

Right now might be the time to spend with your child as much as possible and then go back to work when she is school age?