Do not just give a gift card. Pre-book the appointment. Offer to babysit. Drive her there. In the invitation, include notes like: “They have heated tables. They use unscented oil because you’re allergic to lavender. Your appointment is with Sofia—she has three kids.”
Gifting a massage is an art. You cannot simply text a link. To make land properly, follow this script: allgirlmassage a mothers gift

