Just like you, she may have joined an online dating site in the hopes of moving on, but upon finding your dating profile she was unable to keep herself from checking into it.
Although she may have dumped you recently, she may not have done so happily.
Send messages that relate to something that they wrote about on their online dating profiles with a good amount of detail.
This shows these women that you actually took the time to read their bio and dramatically increases the chances that you will get responses from these women.
Guys on online dating sites often make the mistake of sending bland and generic messages to women that they like without realizing how self-defeating that is.