maybe I am over thinking this and her asking 200 isn't bad, but I really don't want her to see me as someone who will just give credit all the time, because my margins are thin already on the property and I typically invest a lot into making a place nice for people. 

This way they have a good cashflow, a lot of credit for capital gain due to capital improvement and a forced appreciation of your asset. 

This means rental income, dividends, and capital gains from U.S. investments must be reported on your Canadian tax return.Foreign Tax Credit: The good news is that Canada has a tax treaty with the U.S. to prevent double taxation.

Cash money, seasoned in a bank account, plus the ability to qualify for a loan - credit history, job length, etc...

or literally he can choose to never pay and my credit gets in trouble?

Additionally, strong credit, a solid track record in similar projects, and a well-detailed plan for the rehab can also improve your chances of securing favorable financing terms.

We offered asking price + a seller credit for our closing costs and won out over a cash buyer who wasn't willing to come up to the seller's asking price (luck - we got lucky).

Or use your credit card or get one if you're able to, preferably at 0% interest.

Total cost about $35k before hopeful tax credits.   

He feels emotionally attached to people who have had to hustle for a few years working a crappy job and building up credit because that is what he did.