you cannot bend an existing body. the trick is to use a curved body like a sphere to cut your shape out. here’s how i’d do it, you can open the screenshots by clicking on the steps:
1. switch to the front view and draw a circle and the vertical diameter (in this example r = 50mm)
4. switch to the top view and draw the shape of a petal. add a line in the middle first (l = 9mm), then add the top line with the angle of 22.5 degrees, add the bottom line and use the symmetry constraint, then finally add a circle and use the tangent constraint. you can also trim some lines and add two more droplet shapes with the offset edge tool (0.3mm & 3mm)
8. bevel the middle part, i just don't know how. i tried lofting, splitting the petal into smaller pieces but nothing worked for me. maybe you or someone else know the trick
9. create a pattern around the z axis, 8 petals across the 360 degrees
update: i think in the original example they used a different plane for the petals. i created another version where the plane is perpendicular to the radius what is the center of the circle. the downside of this method is that the edges are overlapping (just like in the original example) and preventing that would require more steps like lofting to counterbalance the curve.
Here is a different method than @gex used to create one petal for the flower. I started with something resembling yours, and added a mid-plane the petal sides. Then moved that plane out of the petal. That plane is parallel to the axis of your petal.
Then I sketched a rectangle and a profile to define the top and bottom surfaces of the petal. I used spline, but you could use arc… depends on what you’re after. Then I extruded to cut away parts not needed.