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I had to search for it Vulpini, but Sakura taught her Chakra Enhanced Strength. It was passed down to her in the literal sense, unless someone thinks that you can gain CES naturally through genetics.
Source: NF @ Boruto Spoiler Thread Page 2.
It doesn't mention anything about her training. It says she inherited it, but doesn't necessarily means Sakura trained her.
Boruto inherited Naruto's rasengan, it doesn't necessarily means Naruto trained him to do it.