You say stbx, but there's no indication you are doing anything with lawyers, making it "real"? Where are you living, why are you homeless, do you have a job at all? I don't know the situation with the stbx; how you left, how long you have been gone and why you haven't found a place to stay; homeless shelter or some setup for yourself but have been gone enough to be visiting "regularly".

Take care of yourself first! Your daughter will just have to wait until you are before it is tenable for you to see/have her visit, etc. Make sure you get legal representation so you can see her regularly in the future, etc. Tell her and/or your stbx that you are on a "business trip" or something and set a date you will be "back" for her so she doesn't have to worry and can look forward to seeing you again, etc. Then get your act together better.