Just thinking out loud:
- a pressure sensor under the pillow/matras(?) could be an alternative as it won't trigger the alarm if you walk through the bundle.
might need some calibration
- a distance sensor (aka PING) that will measure distance to the wall and will detect if she sits up.
Note the range of these differ quite a bit. There are examples on the playground.
- Also add some buttons she can press when she needs you. You could even add multiple buttons for different requests
button 1 = come quick
button 2 = come ( no hurry)
button 3 = meal (BF, L, E)
button 4 = phone
button 5 = cup of tea, water, orange, juice
etc.