West opens 1NT* weak NT, 12-14. Me and my partner have agreed cappelleti. So when she doubles, my choices was limited - at least that's what I thought. I jumped to game.
(1NT)-X-(p)-4♥
However, partner was not finished!
(..)
(p)-5♦!-(p)-?
No agreements, so clearly this is natural. New suit at 5th-level is not your everyday hand!
1. Is 4♥ correct? What should I have done otherwise?
2. After partners 5♦ - what are my options?

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