Why do u call vehicles and machines "her" ? not "him"?

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Sometimes people are referring to mechanical objects as "she":

"I love my car, ain't she a beauty?"

Gender is also used in English to refer to certain abstract ideas or institutions. For example:

'The Church always protects her own',
...or
'Justice unleashed her judgement'.


>>Vehicles:

Vehicles, including ships, cars, trains and even engines often take the feminine gender, especially in informal contexts and when spoken of by men (“My car, she’s a beauty.”). Feminizing ships is a markedly entrenched practice, the tradition tracing back in English to as early as the 14th century.

A boat may have a mothership and sister ships. Even ships named after men, such as the German battleship Bismarck, are treated as feminine:

"On her maiden voyage, the Bismarck collided with another ship but she sustained no damage."

As @Phinn said also about the naval tradition when referring to ships.

The only thing is that I've haven't come across someone to refer to coffee as a "she".

Could you provide an example please?

I hope that helps!