Doing an an extra a level in one year ? Any experience

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So DD suddenly says she regrets not doing chemistry and we have a year left ie she's in her second year of a levels now ,is it possible to catch up ?
If I got a tutor ,would it be possible thinking about experiments ? I don't know much about chemistry
She's very bright and works hard she got an 8 at gcse

We were warned off a Foundation by a couple of Unis which is why DD did Bio in a Gap year instead. She ended up doing a Foundation anyway which she said was very useful. She sailed through it and is about to start Y1 of her degree with a running start.
I really wish she had done that instead of the Bio in 1 year even though that was cheaper