After breakup dating?

if you date a girl a few months after her break up than whom you've been been friends with and we are practically the same person inside almost everything is common between us and we have a great understanding between each other. she's shy and a bit religious, we almost everything about each other. but she saying she'll not be able to be in a relationship and I've been a bit desperate since then. which pissed her​ off. even the friendship is awkward now.
now is there any way to get that girl back?
After breakup dating?
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