Presumably the two pots are presented as just the one on the website?
My SIPP with HL is technically formed from four different pots, but presented as one.
Whenever we have asked for a particular drawdown, HL just send the amount with no questions asked.
However, behind the scenes, I note they always take a proportion of the total drawdown from each of the constituent pots. (Proportionate to each pot's size, that is.)
This happened for the TFLS, (so all pots went into drawdown together), and for every subsequent monthly drawdown.
In other words, their system keeps the four pots discrete and separate for the records, but in every practical respect we, the punter, only ever 'see' the one pot.
That's a long winded way to suggest whether she might perhaps ask for it to be taken proportionally from both? - Assuming the drawdown status of both pots are the same, though.