wish her happiness and health !
If I am not wrong the Belgian titles indeed stopped with Amadeo and his siblings as they were grandchildren of the king but the little one doesn't held such position and thus I think she will have the Habsburg ones and maybe lady X van Belgi? (alla lady louise?)
from our dear wikipedia
Although an announcement of Amedeo's engagement was published on the Royal Family's website, no dynastic authorisation for his marriage was published prior to his wedding, as foreseen in Article 85 of the Belgian Constitution. Speculation in the media included a commentator on the military parade for La Une who, on 21 July 2014 (Belgian National Day), alleged that no royal authorisation was announced because the prince intentionally chose not to request permission to marry, and therefore Amedeo was no longer deemed in the line of succession. On 28 July 2015 Le Soir, along with other news media  confirmed that Amedeo had renounced his place in the order of succession because he wished to live an independent life, free of any official role. On 12 November 2015, however, more than a year after the wedding, a royal decree expressing King Philip's retroactive permission for the marriage was gazetted in the Moniteur Belge. Some Belgian politicians opposed the royal decree on constitutional grounds; this was called 'Amedeogate'
Due to a royal decree issued by his uncle King Philippe limiting the number of family members bearing royal titles, Amedeo's daughter and any future children are not styled Prince/Princess of Belgium.