General id question on huge unknown orchid

[Jubilee]

My mom picked up a (now) very large orchid from Meijier some years ago. It has a tag, but Google seems to indicate that it's definitely the wrong tag. (All I get are cactus pictures when looking it up.) I know getting a specific id is dang near impossible, but I'm looking for a best guess on what it might possibly be so that I know what it actually prefers in regards to soil, watering, temperatures and etcetera. It really is quite huge. The pot is about 18" tall and the leaves come up to my shoulder (I'm 5'3"). There are also some long trailing leaves. It flowers with light purplish/lavender flowers in the spring (I don't have a picture, unfortunately). Any help at all would be great. Knowing Mom it's probably in regular potting soil and gets watered about once a week when it's inside for the winter. In the summer it's on a southern facing deck and gets watered daily.