There isn't a direct, single, universally accepted Hebrew spelling for the name Karla. Hebrew doesn't have a direct equivalent for the sounds in "Karla". To transliterate it, you'd need to choose the closest sounding Hebrew letters, resulting in several possible spellings, depending on which sounds you prioritize. There's no "right" answer.
Some possibilities might include:
* קרלה (Karla): This is a fairly straightforward transliteration, using the closest equivalent letters.
Ultimately, the best spelling would depend on personal preference and how the name sounds to the person choosing the spelling.