I saw one with DD1. He was an expert in infant reflux. For my DD, he didn't order any tests, just asked lots of questions about her symptoms, feeding habits and weight gain. He did examine her, but minimally.
I would separate your questions into the use of medication to treat her current symptoms, which is your more immediate concern, and questions about possible allergies/intolerances.
The next step up from ranitidine is Omeprazole so I would ask about this. It is generally very effective. The only trouble is that it is a pain to administer to babies as you have to dissolve them and administer the appropriate amount by syringe. The only really suitable brand I found were Losec MUPS as the others didn't dissolve properly. If your daughter's symptoms are very severe, they could decide at a later date to examine her oesophagus, but I'd say this wouldn't be a consideration at her age.
Secondly, reflux is often related to an allergy or intolerance of Cow's Milk Protein (not lactose - it is very rare for a baby to be lactose intolerant). Allergies (as I understand) tend to have a more immediate reaction and often come with issues like skin hives/eczema or breathing problems. Intolerances are more related to the digestive tract, so it's worth asking their opinion on this. If it is a problem with Cow's Milk and you are formula feeding, then you would need to try either an extensively hydrolysed formula (we tried one called Pepti Junior but DD didn't get on with it), or a completely cow's milk-free formula such as Neocate or Nutramigen.
We were told that the only real evidence was an improvement in symptoms. DD1's symptoms did improve with Neocate, although she was still a bit sicky. We were lucky in that Ranitidine completely took away all pain for her. DD2 was less sicky, but needed Omeprazole for silent reflux.
Hope some of this is helpful and your appointment goes well.