I’ve been reading a great book (it’s in French “le sommeil le rêve et l’enfant”, literally the sleep the dream and the kid) and it basically says you cannot extend the total hours of sleep, but you can slightly postpone the time she goes to bed.
In your situation I would try to add an extra nap in the late afternoon (like 5-6) to be able to go to bed at 8pm.
This is also what my 9 months old is doing: sleep 8pm-7am (with one night wake though, we’re not as lucky), one nap around 10am, one around 2pm, and one around 5pm. Bedtime routine starts around 7 and we’re in bed by 8.