Lalaa, my oldest son, now a very strapping 8 year old was a sicky baby too. Like your dd he gained weight throughout and was healthy in other respects. I told the doctors about it and was given the same advice about holding him upright after a feed. Never advised about gaviston and never gave it to my son.
As the spew-splattered months went on, dh and I became more and more matter of fact about it. Our ds seem totally untraumatised about being sick, usually grinning after it and sometimes through it. He had a good appetite, and kept down a lot of the milk he drank. He was less sick with solids, but if given milk to drink with or just after solids, the projectile vomit was astonishing. When you start to wean your dd, if possible, I'd advise you to try and give her water to drink with her solids.
My ds grew into a sicky toddler and it was not until he was 4 or so that we could guarantee a week of no sick.
Looking back and with the knowledge I have gleaned from reading mumsnet, I think my ds had a slight case of undiagnosed reflux, but as I believe it is not really treatable, there is little we could have done had we realised.
4 years was also about the age my ds finally stopped drooling and dribbling - I have fond memories of him drooling in delight over a new toy in unguarded moments.
Just a word of warning - my ds had, and still has, temporary hearing problems from time to time. Again, not too serious, and an audioloist keeps and eye (ear?) on him. His hearing loss is caused by the tubes in his ears not keeping pace with growth spurts and this is linked to his infant reflux - again a product of underdeveloped soft tissue. He will, we are told, grow out of it, just as he did his reflux.
So it may be worth paying extra close attention to your dd's hearing.
HTH