Veil tails can have the spikey look to them. Here is ZEBRA, she is a combtail. That is a decent outcome of a CT/VT probably f2 if anything. veil tail is veil tail. you can get crosses like this, and with females it'll be more defined when they have fully grown.
THAT is the only way the betta will be anything like a CT, and it's still considered a VT.
Second picture is Crayola. His fins have the spikey ends, his dorsal has the shaggy look to them. He is a VT. As he as a pet store betta, it could very much be possible in his genetics to have CT somewhere, as wholesalers cross types to get different looks and colors - hence sometimes you get the shaggy types. It's still a VT.
The last one, is one I found on google. That is a juvi crowntail.
The rays on bettas, can help determine the tail type as well. But someone else has to pipe up for that, as I am no good in explaining :)
EDIT Your betta looks to be a VT female, because the shape of her belly. See how my Zebra is? Same shape of body. I have females who have long fins, and short fins, are are all VT.
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