Can you make a Reflection from a Reflection with LeBlanc?

Yes, you can create a Reflection unit token that is a copy of an existing Reflection unit token.

According to RiftJudge FAQ #9732:

• Token units are units and follow all rules for their type.
• When a Reflection token enters play, it becomes a copy of a target unit already in play.
• If you target an existing Reflection token, the new Reflection token will copy the current characteristics of that token (including the card it is currently copying, as those are its current traits).

Since a Reflection token is a unit, it is a valid target for the ability provided by LeBlanc that creates these tokens.