Yes the same proof you have that she was abducted.
Some indications of an abduction, to remind you:
1) History: Three abductions of little blond haired girls in just over two and a half years. All within about 18 miles from PdL. Same period of time, same locality
2) A golden witness, Jane Tanner
3) Mrs Caroline Carpenters audio witnessing
4) Lies by Amaral, or his crew, to try and get Gerry to confess
5) The ?deliberate promotion of Eddie and Keela as having proven the case. Totally untrue
6) Previous Fitting up of Leonor and Joao with NO EVIDENCE. Just a story invented by Amaral and Cristovao.
7) History and Character of Gerry and Kate. No lies, very reserved approach. Not like Karen Matthews who was so widely acclaimed by the [ censored word]. Yeah ... RIGHT !
8) 5A = Perfect spot. Totally hidden front door, in darkness with no one passing.
9) watchers in the days before hand
10) Previous very recent burglaries in same block using a key
11) No motive for the Mccanns to do it
12) Very obvious disinformation re Kate and Gerry, put about. Similar to disinformation and lies put about about Leonor Cipriano
13) Means to do it. None. No car.
14) Opportunity to do it . None. Watched all the time ... or presence at relevant time witnessed by others
15) Indications they have done it. None. loving parents
16) A very plausible trail to a certain place and a certain person. Now there is room for errors here, but I dont think so, cos other things which I cannot repeat atm, ex judicy possibly, fit totally.
yep, it was an adbduction, alright ... cos i have a further two reasons that I cannot give (ex judicy) + a most unusual outlining verification via an unexpected source