Munoz, having begun the last round one shot off the lead, pushed her claims with a superb start which saw her reach the turn in 30 following birdies on the second, fourth, sixth, seventh and nine.
She then added another birdie on the 15th to strengthen her bid and then, despite dropping her only shot of the day on the par-four 17th, she got up and down from the back of the 18th green to hold on for her third career title.
The 25-year-old, who finished 14 under par for the tournament, said on ladieseuropeantour.com: "It's been a long year and I've been playing really bad and since Solheim it's got much better and I'm just really happy to have won here.
"Right from the beginning I started to play really well; I hit it really close so I had a couple of tap-in birdies and in the end, I didn't make many putts, but it was enough from the front nine so I'm really happy."
French duo Nocera and Derrey, who were joint overnight leaders along with compatriot Joanna Klatten, finished just adrift after both players carded three-under-par 67s on Sunday.
Nocera suffered a costly bogey on the par-three 16th while local professional Derrey failed to build on an outward nine of five-under-par as she came back in two-over-par after dropping shots on the 13th and 14th holes.
Both players needed a birdie on the last to force a play-off but they could record pars.
Klatten (68) was fourth on 12 under while her fellow Frenchwoman Karine Icher's impressive 64 saw her finish fifth on 10 under, level with South African Lee-Anne Pace (68)
Of the leading British contingent, Solheim Cup victor Charley Hull of England (71) finished seven under for the tournament, alongside Sahra Hassan (68) of Wales.