I know itv is notoriously famous for their timeline amnesia but here is my calculation
Arylie got married when Malini was going for an abortion so that makes her 3-4 months pregnant. Let's take 4 months and she came back when Gudiya was 3 months so 5 months of pregnancy and 3 months of Gudiya. Arylie were married for 8-9 months when they separated.
Now the separation was for 5 years and 6 months
So currently they have been married for 6 years and 2 months and Gudiya is 5.9 years old