I could be wrong but when she talked about the teacher letting Harry call before, it sounded like it was off of the teacher’s own phone?? Which is in itself very unfair and inappropriate imo - it’s not like teachers get company phones!
Also does anyone feel like the child is skipping happily into school because it’s the husband dropping him off instead of Sarah this time
she probably has the child so worked up about making sure he calls her, that the child feels obliged to ring her to put HER at ease!