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My assessment of your situation is that this IS dominance. It is natural for the old dog to try to instill in the new one from the start that she ranks above the new dog. In the end, when both are adults, they will work it out between themselves, and sometimes it is the new dog who "takes over." Not all old dogs do it, not all new dogs initiate it, but no reason to worry that you are seeing it now.
Most likely you would see the behaviour when your new puppy is demanding or receiving something very valuable such as treats or attention. Humping is a normal and non-aggressive communication between your two dogs, and there are many other harmless displays of dominance and submission that you will continue to see displayed between the two dogs in play and throughout their lives.
Let dogs be dogs.
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