Tama isn't fighting her animals are or her Smiles, neither of which are coming with her
Yes, she can fight and she has a unique Monster Hunter / Kaiju Tamer niche on top of being a ninja
Yet again, Luffy has never stated that his nakama need to be strong or even know how to fight, and even if he did Tama has proven her worth in the battlefield by saving other stawhats lifes, not only that, she left main land Wano, infiltrated Onigashima and turned the tides of the battle by herself. What more do you want from her?
be honest, is it that she's missing some super big bazongas and a big CoC to go with it?