As you've already discovered St. Mary the Virgin, High Halden isn't in the IGI. There are however some enteries, if you're lucky, which have been addes by individuals (some of my Jennings are recorded). The Kent Family History Society include High Halden marriages on their CD12
Apart from these records, when I last looked at the PR's, the microfilm copy was in the Centre for Kentish Studies in Maidstone.
Hope this is of use
KJ
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RICHFORD - one name study - with specific interests in Kent (Deptford) and Middlesex (The Tower Hamlets). JENNINGS - from Little Chart/High Halden/Biddenden/Deptford Kent other names include: BARHAM (Kent), LYMER (Staffs), PAULDEN (Manchester -London), SPIKE (Deptford, Kent), POPKIN(S) (Deptford, Kent) to name a few. Also interested in Deptford (Kent) and the associated Naval dockyard.
This is an old request so I don't know if you are still looking for Eliza's baptism but, if so, there are now some High Halden parish records on the IGI (batch number C033828) including the baptism of an Eliza BUMGER (sic) 1810. I wonder if this is a mistranscription for something else