Answer: Your Pony Tail plant (Beaucarnea recurvata) sounds unhappy and I suspect it's from overwatering. The bulb-like base of the plant stores water, so the soil can become dry between waterings without harming the plant. Here are some basic guidelines for care:
Provide average household warmth with a minimum of 50F in winter. Place in a brightly lit spot - some sun is beneficial. Water thoroughly, then leave until the soil is moderately dry.
When give proper conditions, your plant can reach up to 6' tall.
Since you've recently repotted the plant, place it in a warm, bright area and allow the soil to dry before watering again. If the stem gets really soft and mushy, cut it back to the top of the bulb. If the bulb is healthy it will produce new stem and leaves. If not, you'll have to replace the plant.
Hope your pony tail regains its health!
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