Hi, Aria, and welcome to the site!

Your application is coming along really nicely so far, but before we can accept it, there are just a few things in your application to address.
First of all, on site we use our character's first name and last name for usernames. That being the case, we'll need to have you change your username to your character's name. You can do this by submitting a helpdesk ticket
here and asking for the change.
Secondly, you mention a 'prediction ability', which I take to mean something along the lines of Seer abilities. On our site, such abilities would fall into the category of we consider a Special Ability, which would require submitting a
Special Request to the administrators. If you feel this ability is absolutely essential to Aria's character, then you'll need to submit a Special Request and wait for it to be processed. For now, though, please edit out all mentions of the prediction ability from her application.
Thirdly, you say that Aria is from Italy, so I'm quite curious as to how she would get to Hogwarts—could you please elaborate on her background? As you don't mention any move to the UK and seem to imply that she was raised in Italy, it's far more likely that she would receive one from the Italian school of magic than one from Hogwarts, which is in a completely different country. Did her family move to the UK at some point, perhaps?
Fourthly, in your RP sample, you say that Aria is in Hufflepuff. While your preferences for a House will certainly be taken into consideration by the administrators, there is no guarantee that your character will be placed there, so I have to ask that you edit this out.
In your RP sample you also have Aria leave the scene. If this were a real role-play, that would make for an abrupt ending and not give your partner, Evangeline, much to reply to, so if you could just edit the role-play sample so that Aria stays around and interacts with Evangeline, that’d be super!
Lastly, you say that Aria was adopted by Muggles, so there’s just one thing I want to make sure you know. On HS-net there was a major site plot called the
Time Warp, which effectively threw Wizarding Britain back into the 30's and caused all wizards' Muggle relatives to disappear. If Aria, being 11-12, was adopted any earlier than about 1-2 years old, her Muggle adopted family would’ve disappeared—so she would've had to be adopted at around 1-2 in order for your story to remain intact. This is just something to keep in mind, of course.

Once you've made the changes, please post your entire edited application below and we can give it another look. ^_^
Thank you! <3
—'ries