@hymenopus I hope you misted her habitat, as few mantids enjoy getting misted directly - most seem to get offended by it. Yes photos are required for help usually as very few things can be identified by text alone.
She has a bubble in her wings? Are you referring to water itself, her bent wings near the tip of her abdomen, or what exactly as I do not see any bubble in the photo. The bend in her wings and what appears to be her two hind walking leg tarsi/feet, were malformed in her final molt, most likely as she did not have enough height space in her habitat though.
If her abdomen size has increased dramatically recently she is likely forming a ooth. Most females lay a ooth once a week when they are sexual mature, but times can vary, especially for the first ooth. If she has visible water on her it should evaporate on it's own. Ideally a mantid habitat wall gets misted for their humidity needs, with the light water mist evaporating within about 30 minutes. Mantids get their water needs from the fluids of it's prey, and don't drink water directly often unless humidity is a issue.
Mantid old age can not be determined from a photo other than what instar they are based from size or visual development - as they do not have skin developing wrinkles, age spots, white hair, etc. Being that she is an adult forming her first ooth however she is likely 7-8 months of age.