I find it tricky with gel polish if the colours are very pigmented to blend them together. Another thing you can try is putting your pink/nude base down, curing, then apply clear top coat 2/3 down the nail (or how far you want it), and then take your white and apply it to the tip and push it slightly into the clear topcoat. Then take your ombre brush and blend them side to side. I have done this a couple times with strong colors (but never pink/white), I will see if I find a picture for reference. Babyboomer's easier to achieve with pink and white in hard gels though, if you do gel extensions.
PS: I found photos of nails i did with both tecnhiques. Hard gel fade (pink and white) and Gel polish fade (colourful). Will try to attach the photos..