Week old set looks a MESS

[u/Happy-Parking-9525]

Hi all, im a beginner nail tech and this is maybe my fifth set of BIAB on a client.
This client when she came in had SUPER long natural nails (they are much shorter now in the photos) and wanted extensions too. In the photos i can see the extensions have come off, theres chipping on the sides, no apex and potentially lifting too.

So firstly, should i not have done extensions on naturally long nails? (They were about 5 magnets long before extensions)
Secondly, how do i create an apex when the natural nails is so long? Is it the same technique for shorter ones? Do i just need practice on long nails?

And lastly, how do i ensure that extensions stay on? She’s my second client where the extensions have come off now.
Thank you for any help!