Is this too much of exercise?

How are you feeling? First signs of overtraining is fatigued, but it all really depends on your intensity levels and whether your CNS (Central Nervous System) is coping.

Do you deel energetic or a bit run down?

If you're enjoying working that much then I would say no. Im physically active for longer than that every day and it's not considered too much. Try and mix your workouts up a little so you don't get stale.

You friend needs to get up off her tushie. Have you ever looked at the exercise log of an elite athlete?

You can also alternate muscle groups if you really want to do strength training every day. We do shoulders and back one day, biceps triceps another and legs and lower back the third day. I think you're doing a great job!

It's not too much if your body feels ok with it, but it's more than I would have time for. I would ditch the elliptical, but then I think it's boring and a little pointless. If you enjoy it, then keep on with it.

Doing strength training for longer than 60 minutes is detrimental as your glycogen levels have been depleted and your body will start to use muscle and fat, known as catabolism which will only end a smaller fat version of you aka skinny fat...

Ideally you want to retain as much muscle mass as possible which will help burn calories even when you rest.

So my advice is to take it easy and don't overdo and make sure you get plenty of rest...

Just to give you an idea how my schedule looks like:
Monday - Rest
Tuesday - Lower Body Strength Training
Wednesday - Upper Body Strength Training
Thursday - Light Cardio to loosen legs (20 min Incline brisk walk)
Friday - Cardio ( 20 min HIIT)
Saturday - Lower Body Strength Training
Sunday - Upper Body Strength Training

The instructor have split up my exercise this way:
day 1 - aims Upper body muscles
day 2 - aims Lower body muscles
day 3 - Floor exercises

She had split up the cardio as 20 mins - Threadmil, 20 mins - Elliptical, 10 mins - Cycling. I used to follow this regime when I joined. But then I started to feel more at ease with the elliptical & I also found that the elliptical burns more calories than any other machines. Even though I sometimes feel tired, I get a good satisfaction from it. I hope I amnot doing wrong..

It's a lot better as you ideally want to raise your heart rate for 20 mins, when you are ready you can start with HIIT which is one of the best cardio exercises out there...spinning is considered to be HIIT but won't recommend it to beginners, I can hardly walk after a 45 minute spinning session.

Is your friend overweight?

No it's not to much, it's more than you need but not to much.

She is a little overweight. But I am heavy. I wonder if it is of concern if I exercise like this with my current weight. I do love to do it even though occassionally I feel tired. I started out 1 month back with 1 hour of brisk walking at the park (not regular). This month I joined the gym.

Then maybe she doesn't want you to lose weight, because if you are larger than her she will feel better being the 'skinny' friend once you shrink maybe it will highlight her weight battle.

You do what YOU feel comfortable doing, if you healthy enough to exercise that much then kudos to you, keep on pumping and keep on shrinking

Doing strength training for longer than 60 minutes is detrimental as your glycogen levels have been depleted and your body will start to use muscle and fat, known as catabolism which will only end a smaller fat version of you aka skinny fat...

Ideally you want to retain as much muscle mass as possible which will help burn calories even when you rest.

Out of interest, how is this affected by doing, for example, 45mins weights followed by 60mins cardio?

My only concern is that you seem to have jumped into this amount of exercise pretty quickly and might burn out on it too quickly.
Otherwise, if your body doesn't hurt and you aren't feeling fatigued, keep rocking!