Ah, so she is crossed with a Rough collie then? So many people refer to these as just collies but sometimes refer to borders as just collies too so you never know which collie they mean. The proper name for the breed that lassie was is Rough Collie.

Actually, the only true collie is the Border collie because the other three are a result of crossing the original collie breed with totally different dogs. The Border collie is the only direct descendent of the original founding collie breed and still looks pretty much like it.

Yes, rough collies are generally more sedate than Borders but then the aussie side will up that energy a bit no doubt. For a growing dog, yes, too much exercise is bad but more regular shorter walks spread across the day are better than just one walk in a whole 24 hour period. Maybe try and split the time into two or three shorter walks so she doesn't spend so many consecutive hours stuck at home.

If Chloe was used to getting her way before, no doubt if you decide to start ignoring her, she'll try even harder to get what she was used to getting. This is bound to happen and the rules of starting as you mean to go on is the best advice when getting a new pup so that this doesn't occur in the first place. You'd have to stick rigidly to your plans and never give in if you want this to work. It won't go away overnight no doubt and being as fogs are individuals, nobody can say for sure how long it will be before she gets the message. It's just a case of slogging it out.

If she gets overly excited when people return home, you can do a little more than just ignore the behaviour until she has calmed. Make sure when she has calmed, you give her the attention in an inner room away from doorways and get her to sit for a food reward before she gets the attention. This way, when you get home, instead of rushing around you in the hallways or whatever, she'll probably make her way to the room she gets her reward and fuss in and wait for you to come in. This gives you chance to take your outdoor clobber off and sort yourself out before going in there and greeting her calmly. The food reward will be an incentive for her to make her way to that room straight away.