Sorry, but story resembles a bedtime tale . I don't get how you could send her a tip if (from what you just said) she had very little knowledge on bitcoin. Sure you could generate a new address for her, send tip over there and hand out the relevant QR, but the questions remain whether you had time for that and if she was intelligent enough to utilize that QR.
These days we have google and other search engines to find anything we want. If the person have this intelligence that to find something she needs to use the search engine then they will figure out the rest.
True that, I mean it's a tip, anyone who got tip should be grateful regardless what kind of tip she/he receives as long as it's valuable, telling them to search up for bitcoin will get them to understand it anyway, not to mention that most of people right now have higher IQ than decades ago.