Is it normal for her to want to talk to me constantly?

I love my fiancée very much, but she wants to talk to me literally 24/7. She texts me all day and gets upset when I don’t reply quickly and she calls me maybe six times per day. Every time she wants to stay on the phone even when we don’t have anything to talk about and it’s silent and then when so say “okay well i’ll talk to you later” she gets defensive. It wasn’t always like this and I am losing it. I love her but I need my alone time to be my time. I’ve told her this and it clicks for a few days but then it always ends up back here. I’m tired.