Translations for desperately in French

Here are paragraphs from public domain books translated:
She began to run, to run with all her might, and screamed out desperately for help. But the dog came up with her in a few bounds. Elle se mit à courir, à courir de toutes ses forces, et elle appelait au secours désespérément. Mais, en quelques sauts, le chien la rejoignait.
The Confessions of Arsene Lupin, by Maurice Leblanc Les Confidences d’Arsène Lupin, de Maurice Leblanc
Even now when I think of that nightmare the sweat breaks out upon my brow. What could I do? My useless fowling-piece was in my hand. What help could I get from that? I looked desperately round for some rock or tree, but I was in a bushy jungle with nothing higher than a sapling within sight, while I knew that the creature behind me could tear down an ordinary tree as though it were a reed. My only possible chance lay in flight. I could not move swiftly over the rough, broken ground, but as I looked round me in despair I saw a well-marked, hard-beaten path which ran across in front of me. We had seen several of the sort, the runs of various wild beasts, during our expeditions. Along this I could perhaps hold my own, for I was a fast runner, and in excellent condition. Flinging away my useless gun, I set myself to do such a half-mile as I have never done before or since. My limbs ached, my chest heaved, I felt that my throat would burst for want of air, and yet with that horror behind me I ran and I ran and ran. At last I paused, hardly able to move. For a moment I thought that I had thrown him off. The path lay still behind me. And then suddenly, with a crashing and a rending, a thudding of giant feet and a panting of monster lungs the beast was upon me once more. He was at my very heels. I was lost. Aujourd’hui encore, je n’évoque pas ce cauchemar sans qu’il m’en vienne au front une sueur. Que pouvais-je faire ? Mon fusil ne m’était d’aucune aide. Je cherchai désespérément des yeux un rocher, un arbre ; mais je me trouvais au milieu de broussailles que dépassait tout juste un arbrisseau, et je savais que l’animal qui me donnait la chasse eût aisément déraciné un arbre ordinaire. Je n’avais de chance que dans la fuite. Le terrain inégal et coupé rendait la marche difficile. Mais en promenant de tous les côtés un regard désespéré, je vis devant moi un sentier très marqué, très battu : déjà, au cours de notre expédition, nous avions remarqué plusieurs de ces pistes frayées par les animaux sauvages. Celle-ci m’offrait le salut, s’il ne tenait qu’à mes jambes. Et m’allégeant de mon fusil, je m’élançai, pour fournir à la course un demi-mille comme jamais je n’en avais fourni un, comme je n’en ai pas fourni un depuis. Tous les membres me faisaient mal, je suffoquais, le manque d’air me brûlait la gorge ; mais, talonné par l’horreur, je courais, je courais, je courais. Enfin, je m’arrêtai, n’en pouvant plus. Et soudain, des craquements, des déchirements, un bruit de pieds géants, un halètement formidable me signalèrent son approche. Il me rattrapait. J’étais perdu.
The Lost World, by Arthur Conan Doyle Le Monde perdu, de Arthur Conan Doyle