Danish teen fought off her attacker - now she'll face fine. A 17-year-old girl who was physically and sexually attacked in Sønderborg will herself face charges for being in possession of Pepper spay,

[Barozi]

If the laws are similar than to those in Germany, she simply had the wrong kind of pepper spray.

The can has to mention that it's to fend off attacking animals.
If it doesn't mention that or even mentions that it can be used against humans, then it's illegal.