the only problem i've had with her ↑B is if i use it to grab a ledge, she tends to appear and somehow get spiked by the ledge. but i fixed that problem by aiming up a bit higher.
and her F-tilt and basic A are great close range moves with decent speed, power, and priority. D-smash is her best close range move but its not the only good one. however, relying on 3 moves can make her predictable which is when you add in her throws or U-smash to get the enemy away for a moment.
Zelda has more close range options than you think, but if all else fails you can always rely on Shiek for close combat