If you entered a contract to purchase without actually having the intent to purchase....then you may have committed fraud by the inducement. 

Can I ask her to leave the property since I don't have an intention to extend the lease with her? 

If you feel they're being too harsh, think about their intent.

I've been an accidental than an intentional investor for ~15 years.

Try looking into zillow/Redfin and see what your potential rents you can get near the neighborhood by filtering the bedrooms/bathrooms of the intentional property that you are planning to buy.

Is this my intention?

However public knowledge of this acceptance template was never HUD's intention, as this would be a strategic faux pas by all accounts.

I’m hoping for a mentor with good intentions and a willingness to be involved, someone who knows they’ll benefit from my success. 

As someone who is still learning the ropes in real estate investment, I'm not entirely sure what an experienced investor would estimate for these rehab costs, especially with the intention of selling the property, not renting it.Could anyone provide me with some ballpark figures for a rehab like this?

If you feel they're being too harsh, think about their intent.