TeenHelp - my best-friend's parents

so i met this girl a year ago and we used to hang out all the time. she lives down the road from me so we were always at eachother's houses.
but for a while her parents (her dad more than her mum) would like if we didn't hang out together outside of school.
its been really hard going from hanging out almost weekly to never being able to see each other. it began after the police got called on my friend as someone thought she was going to take her life (and it wasn't me).
the day after he called my mum and requested we not see eachother.
overall it's been very hard to cope with not seeing her?

she hangs out with all her other friends and its hard to see her doing so and i'm LITERALLY not allowed to see her
she complained when i hung out with other friends and didn't invite her but she's not allowed to see me?
i just want to know if i can do anything to make it up to her dad.
again, i don't really know what i did,