I think it would be hard to get people to commit, but if it was viable it would be better to collect it in one rather than chasing people for their quid every game wouldn't it?
I don't know about employment law but it would have to be done correctly, don't know the best option really. Doubt the club will want to put her on their payroll, they'd have to give her a contract of employment then and if I was Lucy I'd want long term commitment not season by season, year by year and I'm not sure they'd want that commitment.
Personally I think it should be included in the business plan of the club, same as travel and accomm for the players etc to come under the heading of marketing/promotion