I'm afraid that lastnight and titchy are incorrect, and thisagain is incomplete...
You receive student finance for the full length of your first undergraduate course. This could be anything from three years (most courses) to seven years (e.g. medicine with an integrated foundation year and intercalation), depending on the course. Integrated masters (e.g. MPhys) are covered, but if you do a masters and then a separate, standalone masters, then you will not receive undergraduate-style student finance for the masters.
There is also on 'gift' year, which can be used only if you (a) drop out and then restart your degree elsewhere, or (b) fail a year and have to repeat it.
I cannot fathom why she would want to do a random year of a degree and then plan to drop out after first year. This is on the grounds that (a) if she has already got a degree elsewhere, she would have to pay for it herself, (b) it's a waste of time and (c) it's going to look very odd on a CV. Has she stated a reason why she would want to do this?
A much better plan would be to do a degree which she has researched properly in advance, which with luck will mean that she gets what she expected, is happy, and has no reason to drop out. After that, she could do a masters - this would typically take one year, and can be (part or fully) funded by the new £10,000 postgrad loans that the government has brought in.