Saska will start preschool in September and I am still breastfeeding her. I was hoping she will stop asking for a milk naturally but I do not see that coming

She will be three in October.
To stop that beautifull time together is not easy ,after almost three years of amazing bonding, for me. It would be easier if she stoped by herself. She asks for a milk quite often, she is not getting any dairy for some time now due to her alergy, so I am supplying her with calcium
Or will she magically stop when she turns three?
Thank you.