Hi Becki,
I cant specifically say it will worth investigating the leak when it gets warm. No telling what condition the liner will be in by that time. In almost all cases, even if the liner hasnt ripped at the corners, and even if you could get it back in the liner track, it will be about impossible not to have big wrinkles all over the bottom. Several of the members here at TFP can attest to this. Ive yet to see an acceptable (to me), liner re-install.
If you have to replace the liner, then your pool will have to be measured accurately so the liner company can provide one that fits your pool. Most likely, no one will sell you a liner without the dimensions.
If you have the origianl paperwork stack from when the pool was built, then maybe there is a "dig sheet" and that dig sheet will have the pool dimensions on it.
If you dont have the dig sheet, any you dont feel you can accurately measure the pool, then contact your local pool store or Pool Builder (PB) and they can measure it for you, for a fee of course. Either can also of course provide and/or install the liner for you too. PB's and Pool Stores usually have favorite liner companies and are hesitant to deviate from their suppliers. Usually because they get prices below retail for repeat business. So you have to do your research to get the big picture.
I have a Vynall Liner and I like it. Seems to be good quality, but Ive only had it for 1 1/2 years, but they have a good reputation, especially when it comes to product support and customer service.
http://vynall.com/
Latham also has a good reputation but I have no personal experience with them.
https://lathampool.com/products/inground-pool-liners
Google is your friend. You can find lots of info about the different manufacturers.
Mayble some other TFP folks will chime in with additional recommendations too.
Pool stores who install pools and pool builders ususally have liner samples that you can look at also. It would be worth at least taking a tour of your local suppliers to have a look at them.