Oh you are just the most ROMANTIC guy!!! Here's my 2 cents.
can you bring her somewhere , like say a restaurant, the least likely place where Rocco would be. Have a co-conspirator bring Rocco to the restaurant and let him head to your table with some sort of shirt or scarf that says " will you marry US"? I am sure you can get a restaurant to bend the rules. Or you could go on a picnic with the same sort of scenario. You could also show up at one of her classes( talk to professor first) and let Rocco stroll in. Once she recognizes him, you can pop in and go down on one knee. I LOVE that you are including him in the plot!! You're a keeper!!! Have fun with this and KEEP US POSTED!!!!!