Sorry, but is Bangkok just a series of malls to you? What about all the other things that I mentioned?
They will have convenient BTS access AND river access. You obviously haven’t had breakfast at the Verandah(Oriental). It’s all part of the Bangkok experience, rather than just going from mall to mall.
They have riverboat access to ICONSIAM
and BTS access to the malls that you mentioned. So they aren’t missing out, they actually have more options.
Either way, anything that fits the OP’s criteria, should be welcome. Any fine tuning discussions are up to us. Of course better if we state our cases, as it will help the OP to communicate it to his daughter.
As they say… “it’s all good”.