It is fair to express your disappointment that they exceeded the cost target you gave them. 

With running this "business" there will be operational input costs.

I have other money that'll cost me 10%.

Can she pay you that same amount to cover some of the costs? 

Security Deposit: 2600Lease states no smoking/painting walls/no hanging things on wallsTenants have moved out and have left two truck loads of garbage to be removed.Damaged doorPainted walls which got on the ceiling and trim Lots of holes on the walls throughout the houseDamage from windows being left open constantly Weed was clearly smoked in the house (smell throughout the place) so we need to deep cleanWater bill wasn't paid so I had to turn back on utilityMissing keyQuoted costs:$450 junk removal (some furniture)$935 for damaged doors/windows, painting cleaning$30 for utility turn onTenants were only there for a year before moving out so a lot of this is beyond normal wear and tear. 

Can you give a cost breakdown?  

Keeps costs low and guests satisfied!

With your costs being less you can invest more into the property to build reviews and get bookings. 

You'll find that rental property investing isn't scary at all and a great property manager can actually save you more money than they will cost!

Always use your own ARVs and rehab costs.