Does weight training causes your clothes to get tight

If she's eating at a surplus, then maybe her clothes are getting tighter. But if she's eating at a deficit, then no. Your not going to be able to bulk up by lifting if eating at a deficit.
Don't be afraid of lifting. It won't make you bulky. Do I look bulky?! No!
Some people are just misinformed so spread bad info. Google nrolfw :-) it's a good program and I like it

Here's what I noticed yesterday... my chest or upper body was bigger, BUT my waist went down...according to my feelings after wearing a skirt and shirt that I haven't worn for a year.
But yes, it is true that anyone can get bigger from weight training and eating at surplus. But if you do it right, you will have broader shoulders, and slimmer waist, a tighter compacted abs. My arms got bigger, and right now I'm during a slight bulk, so it may looked a little ugly with some fats, but after I lean out, it should work well.

Also, agree with ThePHoenixisR, water retention and swellings also have huge roles. Some days I have BLOATED stomach, and some days I HAVE PERFECT flat stomach. Don't worry about getting bulky in the upper body! For me, I don't want bulky legs so I do weights that will MAINTAIN my muscle sizes.

Remember, the heavier the weights, the more your muscles will grow larger as it repairs. If you want to maintain the same size, lift that weight until you feel tense and exhausted.

I can't respond with any science behind it, but speaking from personal experience any time I've started an exercise regimen I do bulk up fast and its frustrating. I build muscle easily and tend to retain water after exercise...for months before it starts to feel "normal" again. Its worse if I'm only weight lifting and dieting. I do better when I balance cardio and weights and diet more evenly.

That's what I thought to since cardio burns more calories than weight training.

This is actually incorrect. Cardio only burns calories while you're doing them. Once you stop cardio, you cease to burn calories.

When you weight train, the actual activity does indeed burn less, however, the more lean muscle you have, the more calories you will continue to burn even at rest.

And the biggest problem with cardio: if you do too much of it you actually burn off muscle tissue. So you end up skinny fat, and the minute you stop any cardio you will immediately begin to put on weight.

You have to maintain and build muscle. It's a balancing act.

If her change in routine only started a couple weeks ago it is doubtful weights are the reason her clothes are getting tighter. If she was someone who was on the scrawny side before and the uniform has narrow shoulders and sleeves her arms, shoulder and chest work might result in these areas becoming a bit tight (after a lot of hard work). However, this would probably be a good thing if she had narrow shoulders and skinny arms before (the V shape is very sexy!). However, if the "tight" areas are an expanding belly and muffin top, there is no way this is because of lifting!

Whenever I lift I get thinner and start to be able to eat whatever I want. Which is nice. Then I tear a rotator cuff or tear a tendon. Then, I can barely move at all. So this time I am trying to really build endurance, flexibility and stamina. I've put the summer into that. Now, I'm gonna start with a trainer for a couple of sessions which is all I can afford. Give it a try, just don't overdo. :happy:

if her goal is to bulk up, then thats what she is doing. She probably is on a special diet and thats why she cut out cardio. I've been attending a power class for 6 years now, alternating it with cardio workouts, and all I see is better muscle definition, no bulk. I use 15 lb weights on each side of a bar for my chest and arms and up to 50 lb for my legs when we do free weights, I hope this helps