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Your code is pretty close to what you want:

Qp=pAdicField(13,4)
E=EllipticCurve(Qp,[0,0,0,-3267,45630]); E
P=E([-21,324]);P

the answer is

(5 + 11*13 + 12*13^2 + 12*13^3 + O(13^4) : 12 + 11*13 + 13^2 + O(13^4) : 1 + O(13^4)).