Hello, an interesting analogy!
Or it could be a verification deposit, which is usually necessary to start paying out the withdrawal. Can you kindly tell me whether your wife's account has been fully verified and whether she has ever deposited in the casino using the same payment option she preferred for the most recent withdrawal?
Nedless to say the casino is licensed in Malta. To be honest, the company's origin is not that important since almost every casino without, for example, a Greek license is kind of off-shore. Is that so?
The license is worth considering, on the other hand. In any case, good precaution! What is your wife going to do now?
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