Based on the provided search results, there is no specific recommendation for a mechanical female protagonist in a "爽文" (engaging and exciting) novel. However, there are several recommendations for novels with strong female leads or novels in the sci-fi and fantasy genres. Some of these novels may feature elements of action and excitement. Here are a few recommendations that might interest you:
1. "超神機(jī)械師" by 齊佩甲: This novel tells the story of the protagonist, Han Xiao, who leads a group of players to dominate the starry sea in a virtual game. The novel features a sci-fi background, epic battles, and strategic descriptions. While it does not specifically mention a mechanical female protagonist, it may still provide an engaging reading experience.
2. "穿進(jìn)賽博游戲后干掉boss成功上位" by 隗辛: This novel follows the story of a protagonist who finds herself in a virtual game world and discovers that her in-game identity is a federal-level wanted criminal. While it does not mention a mechanical female protagonist, it combines elements of cyberpunk and action, which may appeal to readers looking for excitement.
3. "重生之首席魔女" by 一一三分流火: This novel features a protagonist who is a witch and possesses magical abilities. While it does not specifically mention a mechanical female protagonist, it offers a story of a character's rebirth and their journey to create a new era of prosperity.
Please note that these recommendations are based on the limited information provided in the search results. It is recommended to read reviews or summaries of these novels to determine if they align with your specific preferences for a mechanical female protagonist.