A possible alternative:
[]Get in close, keep the creatures attention focused wholly on you,
-[] Reinforce Suyin and yourself with Vital Qi and attempt to free her movements as you close in and make yourself the main target. Try to stay close and incite it to focus on physical attacks instead of its gravitational fields in order to reduce the risk of cave-in, dancing around it as an annoying shadow. Avoid the use of flight. Offensively, simply attempt to destroy it quickly with our Frozen Seranade, though be prepared to unleash Winter's End if necessary to manage smaller beasts.
Possibly kinda risky though given that our dodge isn't greatly higher than its hit. We are in darkness, so GCD should be working at full power, but the Antlion doesn't have bad accuracy and does have higher penetration than our armor. This could result in significant injuries to us.
Edit: That being said, we do have Deepwood so we should be able to just no-sell anything that actually looks like it will hit us.