I think it's quite ok for you to pick just one of the events to attend, unless if you're one of the bridesmaids or the maid of honour. So for example, you can choose to attend only the bridal shower, where you give her a wedding gift and your blessings, and not attend the other two. Tell her you have to take care of your family, especially the baby, and cannot make it to the other two events even though you really wanted to. If she is a real friend, she'll understand.
"My mission in life is not merely to survive, but to thrive; and to do so with some passion, some compassion, some humor, and some style." -- Maya Angelou (1928-2014)