In ancient Hindu law, 8 forms of marriege prevailed, of which only 3 were valid before 1955. These were Bharma, Gandharva, and Asura.
In modern Hindu Laws, those 8 forms of marriege were divided into 2 classes. Approved marriage & Unapproaved marriege.
Approved marriage = Brahma, Daiva & Prajapatya
Unapproved marrige = Ashura, Gandharva, rakshasha & Paisacha.
The Hindu Marriage Act 1955, doesn't specifically provide for any form of marriage. The Act calls marriage solemnized under the Act as hindu marriage which may be performed in accordance with the shastric rites and ceremonies or in accordance with the customary ceremonies prevalent in the community to which the bride or Bridegroom belongs. However, this DOESN'T mean that a marriage cannot now take place in any one of the aforesaid three forms (Brahma, Gandharva, Asura). marriage can still be entered into any one of the 3 forms by performing necessary ceremonies and rites required by the Act, through distinction between Approved Marriege & Unapproved Marriege is, no longer Tenable, and all marrieges performed after the commerencement of the Act are in only Approved form.
The Gandharva marriege form is fast becoming popular among the younger generation.
It's also a settled Law that in the Gandharva form, the ceremony of KANYADANAM is NOT Essential.
In your case Sonia, you said that she have pictures of the marriege to submit as evidence. If those pictures are Not Photoshopped then, The court will definitly accept this marriege as valid, unless the contrary can be proved by the party asserting so.
Section 114, Evidence Act lays down that where independent evidence of solomnizing of marriege is not available, it will be presumed to be a valid marriege by continuous cohabitation between the parties unless contrary is provided. If a community of neighbours treat a couple as husband and Wife, they are thus reputed to be married, the burden of Proof that they were NOT properly married lies on the party asserting so.
It is the Policy of the law to lean in Favour of Validity of Marriege, once it is proved that it has existed.