Immediately I don’t trust whatever advice she’s dispensing. You can’t just “call places” or “walk in with a resume” anymore. The phone numbers are all automated systems that will never put you in front of people who can hire you. You need a badge to get in anywhere that’ll give you an internship which you can’t get if you don’t work there, and if you did somehow talk to someone they’d just shrug and say “I don’t know how that works, just go to our website and apply there”
Even ignoring the “let them eat cake attitude” it’s obvious she doesn’t even realize how hiring works at her own company. I guarantee you that her advice would not work at Squarespace