There's a lot of confusion on this thread around rights to breastfeed at work.
This link, already shared, establishes the legal situation.
https://www.nct.org.uk/life-parent/work-and-childcare/returning-work/breastfeeding-and-returning-work
Ah employee does not have to provide breastfeeding breaks, but does have to ensure, that within the law, breastfeeding mothers are not discriminated against.
As we have established, OP's baby is not likely to be a newborn. As an older child, their feeds can be managed in the context of her breaks, exactly as a breastfeeding employee working in the office would need to do.
This, from Jason is not correct: l. If she is feeding a baby she is absolutely perfectly entitled to feed on demand.
She isn't. She is not entitled to breastfeeding breaks to feed, but cannot be disadvantaged compared to another employee.
It seems OP's employer is flexible & open to her arrangement - great - but OP for some baffling reason is making a fuss about the very rare occasion when she needs to b/f in a meeting, where cameras are required to be on. There is an option to provide an alternative to her DC at this time, but OP isn't prepared to consider it.