Hi! I took at a look at your site and it all looks pretty good, although you currently have a bunch of empty tags (twitter:app:name:iphone and all of the other twitter:app:… tags) which are redundant as you want to use a Summary Large Image card, so you should ask your developer to remove them.
In order to get approved and to receive a confirmation email you need to visit our cards validator at https://dev.twitter.com/docs/cards/validation/validator and paste the URL www.lorimer.ca/childrens into the validation tool. You’ll see a preview of your card on the right hand side, and that your domain is not approved, with a “Request approval” button. Once we’ve checked your site, we’ll approve you and you’ll get a confirmation email.
That should do it!