Welcome, ChefJoe...
A few thoughts: firstly, "Senior Member" only means that the person has been around CC for a long time and has been active. It doesn't mean the person is mature in Christ, or even a Christian at all... unfortunately.
As for your daughter, others have given you good input. I will mention that
many Catholic beliefs are inconsistent with the truth of the Bible, but helping a Catholic understand that is an uphill battle unless the Holy Spirit is actively working to set them free from the errors. Take it slowly.
Also, your primary witness with your daughter will likely
not be the truth you share, but the life you live. Invite the Holy Spirit to change you from the inside. As you begin to show the fruit of the Spirit (see Galatians 5:22-23), she will notice the changes, but don't try to point anything out. Rather, just let her observe, and treat her with patience, gentleness, and respect. Answer any questions she has, but don't try to force the subject as that will drive her farther away. As for her insults and criticisms, let them roll off your back; Jesus was insulted too. Sharing in the humiliation that He received is no shame for the believer.