Is Summer’s testimony true? Was Hae still alive post 2.36pm?

So I’m re-listening the podcast and one thing that jumped out is Summer’s claim that she spoke to Hae at the gym. They had an important wrestling match that day and Hae said she will join them at the match directly.

If the state’s claim that Adnan did it in 21 mins is true, that means Hae couldn’t have spoken to Summer because she HAD to rush to pick up her cousin.

Anyone knows more about this and if her testimony was ever given at trial? Because it’s a big ‘adnan is innocent’ evidence.