Thanks for all the advice. I think that I am going to offer the following options:
1. Install it in the kitchen
2. Offer her to purchase the new unit from me and keep it on the porch, and she would be responsible for it if it breaks. Potentially I could buy it back from her when she moves out if there is no damage.
3. Let her buy her own units and place them on the porch and be responsible for them if they break.
@Theresa Harris Yes, at this point I wouldn't mind just letting her put her own units out there.
@Adam Martin I actually already went that route when the washer froze in February, and the cheap replacement I bought already went bad.
@Nathan Gesner I agree and would like to take that approach as option 1, however I would rather prevent a tenant turnover at this time.
Sometimes it's difficult to react with reason to someone who is approaching a decision emotionally! Trying to be as empathetic as possible, though. Thanks!