Bitcoin Cash (BCH) works like original Bitcoin. It has no artificial blocksize limit, and has less than $0.01 transaction fees (1 sat/byte).

She could use BCH. Just open Bitcoin.com app on phone, tap "SEND", "Scan a QR code" (or enter email, or phone number, or BCH address), and slide. Video: https://twitter.com/rogerkver/status/1179037602499837954