How can I refresh the ical feed sent to Google Calendar?

I have subscribed to the ical feed so Sandy's calendar will be sent to my Google Calendar, but when I add items, they are not shown on my Google Calendar and I do not receive reminders from Google regularly. I can unsubscribe and resubscribe and that seems to reset the reminders, but that's a pain.

Is there a way I can just send a refresh to Google Calendar?

They don't seem to be able to figure it out on their end. Is there a way Sandy can figure it out on her end so she can either send an automatic refresh every 10 or 15 minutes, or at least a manual option where we can just click on something and it will automatically send a fresh ical feed to update Google Calendar?
 
sad I’m sad and frustrated
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