Hi AnneMarie,

Spider Plant

Spider plants like to be very root bound in small pots. I think when you moved the plant to a larger pot you may have given it too much water. The roots stayed wet and then rotted. If it were my plant, I would take it out of the pot, shake off all the soil, and allow it to sit out bare root for a day or two. Cut off any roots that appear soft and mushy. Repot into a container that is only an inch or two larger than the root ball using fresh dry soil. Cut off all dead or dying leaves. Place in bright indirect lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light.. Hopefully new growth will develop from what roots still remain healthy. You can read all my care tips for a Spider Plant in the Popular Houseplant section of the website.

https://www.houseplant411.com/houseplant/spider-plant-how-to-grow-care