During my own wedding prep, i was shocked at how well the tux fit straight off the rack. The tailored version that wasn't ready until the morning of the ceremony was an absolute nightmare to put on and only stayed in place for the length of the ceremony through the use of copious quantities of safety pins and honest-to-God Scotch tape.
She send via email, and there's maximum size limit, it's 25 MB if I am not wrong. Actually it will be better if she send gdrive link with high res pic instead via email. About .jpg I think that not an issue. Maybe she retouch the raw photo via lightroom and save as .jpg ? But still, sending 100+ pic via email that means the reso and file size are decreased than high res version (even tough the pic already retouched).