Carlton, she told you that "you enter her thoughts now and again". This is telling you LOUD AND CLEAR that she's done with you - but she lacks the courage to end things. Besides, in a good relationship, one doesn't need space to deal with personal issues. In a good relationship, she'd deal with those issues with you standing by her side.
You can hang in this limbo land for as long as you wish - but she's not coming back. Or if she does, she will only be only half arsed about it. For your own sanity, it's far wiser to just end things and move on.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.