In an evenly contested game, Leicester opened the scoring after nine minutes when Sarah Blanks claimed the first of her three goals when she picked up a through ball from Jo Mould.
Three goals at penalty corners, two from Mandy Nicholson and the other from Jane Smith, moved Slough ahead before Blanks took advantage of a goalkeeping error by Lynette Smith to pull a goal back on the interval.
Two minutes into the second half Blanks completed her hat-trick after being put through by the 17-year-old Helen Richardson.
As both teams contested for the winner there were near misses at both ends. First, Purdey Miller and then Blanks squandered opportunities inside a minute for Leicester before Slough's Dutch winger, Monique Slootmaekers, collected a precision free-hit from outside the circle to score the winner with five minutes remaining.
Both sides will represent England in Europe next season.
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