Her Name Is "Charleen Weiß" aka Charlie --> " (jmd.) ' weiß ' " = ' white ' or " (sb.) knows "
<<In German orthography, the grapheme ß, called Eszett (IPA: [ɛsˈtsɛt]) or scharfes S (IPA: [ˈʃaɐ̯fəs ˈʔɛs], [ˈʃaːfəs ˈʔɛs]), in English "sharp S", represents the phoneme in Standard German, specifically when following long vowels and diphthongs, while ss is used after short vowels.
The name Eszett represents the German pronunciation of the two letters S and Z.>>
The letter 'ß' is called 'sz', but you write 'ss' if there is no 'ß' on your keyboard/typewriter.
Usually 'ss' is used instead of 'ß' if there is no 'ß' on your keyboard/typewriter or if machines have to read the word. --> Weiß ==becomes==> Weiss
Since she's internationally active, she used 'Weiss' instead of 'Weiß' and mainly goes by 'Charlie' rather than Charleen.
But if you search for 'Charlie Weiss', google would show results for an American football coach also named 'Charlie Weiss'.
So I think she changed her Instagram handle for a better distinction and for foreigners still being able to write her name...(her actual name is still "Weiß" tho)