The candidate seemed like a great fit. You just wanted to think about ‘it’ over the weekend. You know what? She was thinking about ‘it’ over the weekend, too. Except, ‘it’ was the two offers she received on Friday, but not one from you.
Candidates generally consider their options over the weekend. (Does “I’d like to discuss this with my family over the weekend and get back to you on Monday” sound familiar?). If you can tell candidates on Thursday or Friday that they’ve been selected for an interview or will be getting an offer, then the position for which you are hiring is one of the candidate’s options. If they find out Monday, you may be too late.
Letting candidates know before the weekend will increase the hiring manager’s choice of candidates – and choice equals quality.