The lack of a regular body routine
could put a damper on weight loss... but I'm going to focus instead on what I think is more important.
No one loses weight the same way. Not even people who are related. Your mom might be losing a little faster right now, but that doesn't mean that there is anything "wrong" with you. Was last week near TOM or something? I know that I gain about a lb during my monthly time. There could be a myriad of reasons.
You're doing this for the long-haul. Not just for summer. So there are going to be times when our bodies act weird and refuse to move down on the scale. It's okay. If it happens consistently for awhile then we have to re-evaluate what we're doing. If it's one week... then it could be a number of things and we have to wait until the next to get an idea of what's going on.
Also, if you're more physical than your mother, perhaps she's just losing more muscle than you, too? And that's not really a good thing.
Just make sure you're getting a good amount of sleep, regardless of when you have to wake up. Without sleep... my weight loss stalls BIG TIME.
Keep at it. Continue to eat healthier and exercise. It will pay off!!!