Beginner Gardening: What's wrong with my Queen of the Night?, 1 by fayebaybee

fayebaybee wrote:
Grrr! I can't figure out where to post this so I've just posted it everywhere. Here's the deal:

I really don't know a lot about plants. Despite this fact, my husband's grandmother entrusted her Queen of the Night to me (of all people!) before she passed away. I haven't watered it much. Maybe once a week and not a lot of water when I do. I've kept it inside since she gave it to me last fall. Haven't had a problem until the last week. Since the temperature has been getting near 80 I decided to put it outside for a couple of days last week. I had planned on leaving it out there but I saw the temp. was going to drop off a little so I brought it back in. Today I went into the room it has been living in and was horrified to see the leaves turning brown and crusty. I feel awful and want to know if this is a result of something I have done/need to quit doing or if this is something else I need to treat. What is this stuff? I've already killed two others that she gave me, the first by leaving it out to get scorched by the sun and I think I overwatered the second. I thought I might know what NOT to do by now...Help! This is the last chance I've got and will feel terrible if I've doomed yet another! Thanks in advance for any advice. This is my first post but I'm excited about stumbling onto this site!