All in the family

Family drama: part two.
Well, my husband had a talk with my mom today about my sister, and apparently whatever got up her butt just happened to explode last week, because the stuff she’s been complaining about has been going on for five years. Yeah, pretty much since I started having to do laundry at Mom and Dad’s to save money over the apartment laundromat, I’ve been disturbing her life and turning things upside down.
The new story isn’t about how I’m treating Mom but how my visits make my sister feel. She feels uncomfortable in her own home (Mom and Dad’s home, but she lives there). She doesn’t like us coming over to do laundry whenever we please (never mind that I always ask Mom if it’s okay before I come over), I don’t hang out with my sister like I used to (except I try to ask her if she wants to do stuff and she never joins in), and I “don’t seem like I care” about her (despite the fact that she hides in her room the entire time we’re over there and I make an effort to go to her room and ask how things are going).
Keep in mind that these things have been the same for five years. Since my husband and I moved out of our friend’s house and entered apartment life. The timing is freakin’ weird though. I mean, we are roughly a month away from moving into our own home where we will have our own washer and dryer and no need to mooch off Mom and Dad (if that is indeed what she thinks is going on). A month. And she chooses now of all times to start bitching? This is going to be a nonissue soon. We’ll be able to visit without our motives being called into question. Or will we?
I’m so mentally exhausted over this. I can’t win. Just because things are going right for me for once I’m suddenly this evil bitch.
Now that I now the “real” cause of my sister’s disdain, I was hoping I’d gain some insight as to how to smooth things over. No such luck. I am still as clueless as ever. Do I even bother? Will this blow over once I’m not invading her space anymore? Should I try to go over there sometime and talk to her? For some reason I don’t think that’s too bright of an idea. She has her viewpoint on things, and skewed though it may seem to me she’s set in her mentality. This has been stewing for so long that she has warped reality to fit with this viewpoint. Five. Years.
Why didn’t she speak up sooner? Why let something like this fester, and why bring it to the surface when the offending behavior is about to subside?
This house can’t be finished soon enough. Now I have to find someplace else to do my laundry for the next month. Don’t want to make my sister feel uncomfortable in her own home. Or something.
So done.