The purchase price and date of purchase are agreed to, buyer pays a deposit + monthly rent + monthly rent premium.

Seller financing isn't always a good option because banks specifically forbid it, because the buyer has to take a deed transfer and that would cause a lien position loss on their end. 

Then immediately contact all the cash buyers you just found that buy properties in that neighborhood and tell them about the house and would they be interested in buying it.

Buy anyways, she tried posting the property online for as low as $45,000, and even found a buyer, but the buyer did not have any any money and wasted a lot of her time. 

My contract with them clearly states that I have the right to sublet and/or assign the property.On the other hand my contract with the buyer strictly prohibits any subletting.

This is beneficial to the buyer because of less hoops to jump through, easier negotiations and possibly a lower down payment.

He briefly mentioned the Right to Show Clause: that the buyer reserves the right to show property prior to settlement for purpose of selling, renting or leasing, and the seller agrees to permit access to buyer at anytime up to date of settlement.If anybody has any experience with this, I would love to pick your brain and learn how I can utilize it.Thanks!

Then immediately contact all the cash buyers you just found that buy properties in that neighborhood and tell them about the house and would they be interested in buying it.

Hello @Nadeem Akhtar - here is a checklist provided by Harbor House Buyers I transferred to a Google sheet.

This way, if you can't find a buyer, you can say your "partner" who is imaginary of course, didn't approve this purchase and all you lose is (the $20) earnest money deposit you paid"...?