You being the agent on the house is a sound financial and practical decision. Her dating profile doesn't change that. You didn't place any 'dating' conditions on your offer so do what you said you would do.
Her being on a dating site shows that she hasn't found anyone in real life she wants to date, so that's good. Women I've talked with said you have to wade through a lot of lazy losers looking for 'hook-ups', married (not separated) cheaters, and creeps who email pics of their weiners , to even find someone you might want to have coffee with.
Please don't say a word to her about it. This should help you feel fine about dating. Maybe you need to get your own profile up on a different site too.
, to even find someone you might want to have coffee with. 
