As I understand it, being an athlete recruit does not come with financial assistance for International students, this is for Ivy League only. Only Financial Aid is applicable to UK students for Ivy league applications, some will include assets as part of the calculation (like how much equity is in your property, rental income etc) and how many children you still have of school age. Harvard's calculation was different to others, the most generous from past experience. DD was a deferred early decision Princeton candidate and then withdrew, did not apply to anywhere else due to her programme niche.
Some lower tier colleges do provide sports scholarships of varying percentages to overseas students, some are very generous indeed, but the trade off is an unknown brand outside of US.
It looks like the OP's DC is set on applying to US via the named scholarships discussed, good luck to her OP, it is an impressive aim given how competitive the scholarships are, and applications can run alongside her UCAS process if she's not successful.
Only as PPs have mentioned it, the dual BA with TCD and Columbia does indeed offer a Maths/Economics stream. Also mentioned is that joining Columbia in years 3 and 4 in with the School of General Studies, not Columbia College. Whilst students do sit in class with CC, the integration (this is anecdotal feedback across 3 years) is not as smooth as one would hope. The average age of GS students is circa 27 (this was 2022 entry) and whilst you can apply for FA, it is not really applicable to international students from GS.
A final consideration, given that your DD sounds smart and driven OP, is as others have suggested and opt for a year abroad, but an alternative is via the TCD Foundation Scholarship, a 4 year programme The papers are sat in January Y2, with awards announced in May of Y2. Successful candidates then get 5 years financial award of free tuition, board (extending to PG studies if applicable) meals and stipend, with all students encouraged to take a YA, or semester at the minimum with includes a good US and Canada offering. My DD is not a STEM student, so cannot comment on the quality, just offering another option, Ireland living is not for the faint-hearted if DC are not independent minded
It is all so up in the air re US studies that can put risk onto students that opt for there, with certain programmes like the one my DD does that is available as a 4 years TCD and Dual BA now under federal scrutiny to ensure 'balance is retained'. She believes she would actually be denied entry right now, given her prolific writing within Middle Eastern journals as part of her programme of study. Even if they are not demonstrating bias, the risk of her being flagged is high, and her university is making sure students are aware of this, including warning students of risk of returning home for Christmas/Easter etc for holidays could result in issues of re-entering US to continue their studies.
Interesting times.