Advice on Raising Rent

[Amethyst Green]

Hello all, I know there's a lot on here I've filtered through on raising rent.  I have a strong pulse on the laws in my state and understanding the rules on raising rent (no rent control) That said, I could really use some advice on raising one of my tenants rent.  I have closed on my first duplex and the first time I'm raising rent.  One tenant will be leaving and creating a vacancy in January.  The second, will be a long term tenant, she has autopay and is low maintenance and do not want to lose her as a tendant.  

However, her rent is really low.  She is at $1100.  a month and market for the unit is $1650 .  

Could you all please share your experience, your advice would be so helpful.  

Thank you!!