IG DM-Tried to be patient with a girl by replying slowly - shit test

How to pass this? Want to get her over to text and keep her interested until September but she calls me out on my slow replies. -Both Uni Students -Living in the same area next yr -Unable to meet for a while, so took my time replying. Got called out. Do I comply n give faster replies or what? What is an appropriate response(or to ignore?)