Depending where she is she needs to look at other available livery yards in the area and offer something they don't to appeal to a different market.
You don't say what her hacking is like locally - that is a big deal for most potential liveries particularly the happy hackers which are bread and butter for most yards that don't specialise in competition dressage or SJ or hunting.. If it's x miles of offroad tracks then say so, if it's only 5 minutes from a town, say that.
If she offers just grazing livery that is a good pull for the M&M types like myself who don't want to (or can't afford to) pay for stables and these folk would prefer good offroad hacking to arenas, buy into the low grass grazing options and probably come en masse at a time when many yards move to not allowing turnout at all

If she was close enough to me and offered a field based grazing rate (ie rather than per head) I'd book a field for temporary resting of my own land and I wouldn't be the only one I'm sure with multiple equines and grass that needs sprayed or rested or cross grazed or fences repaired etc, she'd probably do good business with mares being weaned off foals bred at home for instance if offering short term decent rates. Or if she's right by St Andrews or the coastal villages where tourists go, she could offer holiday livery for folk in caravans and cottages - but dependent on her hacking quality again..
A few random thoughts, good luck to her
